Monday, October 24, 2011

Supercluster


Superclusters are large groups of smaller galaxy groups and clusters and are among the largest known structures of the cosmos. They are so large that they are not gravitationally bound and, consequently, partake in the Hubble expansion.
The existence of superclusters indicates that the galaxies in our Universe are not uniformly distributed; most of them are drawn together in groups and clusters, with groups containing up to 50 galaxies and clusters up to several thousand galaxies. Those groups and clusters and additional isolated galaxies in turn form even larger structures called superclusters.
Superclusters form large structures of galaxies, called "filaments", "supercluster complexes", "walls" or "sheets", that may span between several hundred million light-years to one billion light-years, covering more than 5% of the observable universe. Observations of superclusters likely tell us something about the initial condition of the universe when these superclusters were created. The directions of the rotational axes of galaxies within superclusters may also give us insight into the formation process of galaxies early in the history of the Universe.[1]
According to some astronomers, no clusters of superclusters are known; the existence of structures larger than superclusters is debated (see Galaxy filament).[citation needed] Interspersed among superclusters are large voids of space in which few galaxies exist. Even though superclusters are the largest confirmed structures, the total number of superclusters leaves possibilities for structural distribution.
Superclusters are frequently subdivided into groups of clusters called galaxy clouds.
(en.wikipedia.org/wiki/Supercluster)

VISTA Finds New Globular Star Clusters


Two newly discovered globular clusters have been added to the total of just 158 known globular clusters in our Milky Way. They were found in new images from ESO’s VISTA survey telescope as part of the Via Lactea (VVV) survey. This survey has also turned up the first star cluster that is far beyond the centre of the Milky Way and whose light has had to travel right through the dust and gas in the heart of our galaxy to get to us.

The dazzling globular cluster called UKS 1 dominates the right-hand side of the first of the new infrared images from ESO’s VISTA survey telescope at the Paranal Observatory in Chile. But if you can drag your gaze away, there is a surprise lurking in this very rich star field — a fainter globular cluster that was discovered in the data from one of VISTA’s surveys. You will have to look closely to see the other star cluster, which is called VVV CL001: it is a small collection of stars in the left half of the image.

But VVV CL001 is just the first of VISTA’s globular discoveries. The same team has found a second object, dubbed VVV CL002, which appears in image b [1]. This small and faint grouping may also be the globular cluster that is the closest known to the centre of the Milky Way. The discovery of a new globular cluster in our Milky Way is very rare. The last one was discovered in 2010, and only 158 globular clusters were known in our galaxy before the new discoveries.

These new clusters are early discoveries from the VISTA Variables in the Via Lactea (VVV) survey that is systematically studying the central parts of the Milky Way in infrared light. The VVV team is led by Dante Minniti (Pontificia Universidad Católica de Chile) and Philip Lucas (Centre for Astrophysics Research, University of Hertfordshire, UK).

As well as globular clusters, VISTA is finding many open, or galactic clusters, which generally contain fewer, younger, stars than globular clusters and are far more common (eso1128). Another newly announced cluster, VVV CL003, seems to be an open cluster that lies in the direction of the heart of the Milky Way, but much further away, about 15 000 light-years beyond the centre. This is the first such cluster to be discovered on the far side of the Milky Way.

Given the faintness of the newly found clusters, it is no wonder that they have remained hidden for so long; up until a few years ago, UKS 1 (seen in image a), which easily outshines the newcomers, was actually the dimmest known globular cluster in the Milky Way. Because of the absorption and reddening of starlight by interstellar dust, these objects can only be seen in infrared light and VISTA, the world’s largest survey telescope, is ideally suited to searching for new clusters hidden behind dust in the central parts of the Milky Way [2].

One intriguing possibility is that VVV CL001 is gravitationally bound to UKS 1 — making these two stellar groups the Milky Way’s first binary globular cluster pair. But this could just be a line-of-sight effect with the clusters actually separated by a vast distance.

These VISTA pictures were created from images taken though near-infrared filters J (shown in blue), H (shown in green), and Ks (shown in red). The size of the images show only a small fraction of the full VISTA field of view.

Notes
[1] The discovery of the additional new clusters was just announced in San Juan, Argentina, during the first bi-national meeting of the Argentinian and Chilean astronomical associations.

[2] The tiny dust grains that form huge clouds within galaxies scatter blue light much more strongly than red and infrared light. As a result astronomers can see through the dust much more effectively if they study infrared light rather than the usual visible radiation that our eyes are sensitive to.

More information
ESO, the European Southern Observatory, is the foremost intergovernmental astronomy organisation in Europe and the world’s most productive astronomical observatory. It is supported by 15 countries: Austria, Belgium, Brazil, the Czech Republic, Denmark, France, Finland, Germany, Italy, the Netherlands, Portugal, Spain, Sweden, Switzerland and the United Kingdom. ESO carries out an ambitious programme focused on the design, construction and operation of powerful ground-based observing facilities enabling astronomers to make important scientific discoveries. ESO also plays a leading role in promoting and organising cooperation in astronomical research. ESO operates three unique world-class observing sites in Chile: La Silla, Paranal and Chajnantor. At Paranal, ESO operates the Very Large Telescope, the world’s most advanced visible-light astronomical observatory and two survey telescopes. VISTA works in the infrared and is the world’s largest survey telescope and the VLT Survey Telescope is the largest telescope designed to exclusively survey the skies in visible light. ESO is the European partner of a revolutionary astronomical telescope ALMA, the largest astronomical project in existence. ESO is currently planning a 40-metre-class European Extremely Large optical/near-infrared Telescope, the E-ELT, which will become “the world’s biggest eye on the sky”.

Full-size Mock-up of World’s Largest Telescope Mirror Built at ESO’s Open House Day


On Saturday 15 October, the European Southern Observatory (ESO) opened the doors of its headquarters in Garching bei München, Bavaria, Germany, to the public. Throughout the day, thousands of visitors had the chance to help build a full-size mock-up mirror of the largest planned telescope in the world — the European Extremely Large Telescope (E-ELT) — and to experience many other aspects of ESO’s work.
Around 3100 people came to ESO’s headquarters on Saturday, curious to find out more about ESO’s world-class facilities and front-line scientific results. Visitors to the ESO Open House Day 2011 had a wide variety of activities to choose from. The highlight was to take part in the construction of a mock-up mirror for the European Extremely Large Telescope (E-ELT), giving participants a unique chance to experience the true scale of the world’s biggest eye on the sky. Enthusiastic visitors queued up to put the 798 cardboard hexagons in place, each measuring around 1.4 metres across. Using pegs and an outline of the mirror on the ground, visitors placed the hexagons on the ground to slowly form the giant mirror. Meanwhile, a time-lapse video of the assembly was filmed from the roof of the ESO building. When finished, the full-size mock-up measured 39.3 metres across and occupied an area of nearly 1000 square metres next to ESO Headquarters.

There were talks on current hot topics in astronomy in ESO’s auditorium, and video links were established to the Paranal Observatory in Chile, giving people the opportunity to chat live with ESO astronomers working on site. Children and their parents enjoyed having their photo taken in the infrared, and looking at the Sun through telescopes equipped with suitable filters. Among other fun activities, visitors were able to write postcards from the edge of the Universe to their friends and family — to be sent by ESO — and travelled between the stars in a Skyskan planetarium and with the Stellarium programme.

Three exhibitions were dedicated to ESO’s observatories: the Very Large Telescope (VLT), the Atacama Large Millimeter/submillimeter Array (ALMA) and the European Extremely Large Telescope (E-ELT). Visitors saw prototype components for the E-ELT, including a giant deformable mirror, and were able to control a real segment of the main E-ELT mirror. They also took a virtual tour through the E-ELT and steered a virtual giant transporter for the ALMA antennas.

To provide refreshments the ESO Charity Group prepared a buffet of international cuisine with the help of the ESO staff. The money raised from selling the different dishes will be donated to help children in Chile.

This event was part of the Open House Day 2011, organised by many institutes on the Garching research campus. For more information about activities across the campus, please go here.

More information
ESO, the European Southern Observatory, is the foremost intergovernmental astronomy organisation in Europe and the world’s most productive astronomical observatory. It is supported by 15 countries: Austria, Belgium, Brazil, the Czech Republic, Denmark, France, Finland, Germany, Italy, the Netherlands, Portugal, Spain, Sweden, Switzerland and the United Kingdom. ESO carries out an ambitious programme focused on the design, construction and operation of powerful ground-based observing facilities enabling astronomers to make important scientific discoveries. ESO also plays a leading role in promoting and organising cooperation in astronomical research. ESO operates three unique world-class observing sites in Chile: La Silla, Paranal and Chajnantor. At Paranal, ESO operates the Very Large Telescope, the world’s most advanced visible-light astronomical observatory and two survey telescopes. VISTA works in the infrared and is the world’s largest survey telescope and the VLT Survey Telescope is the largest telescope designed to exclusively survey the skies in visible light. ESO is the European partner of a revolutionary astronomical telescope ALMA, the largest astronomical project in existence. ESO is currently planning a 40-metre-class European Extremely Large optical/near-infrared Telescope, the E-ELT, which will become “the world’s biggest eye on the sky”.

Doing more for the stability of the eurozone






Doing more for the stability of the eurozone

(European Commission President Jose Manuel Barroso and European Council President Herman Van Rompuy speak at a press conference in Brussels. AFP photo)
"We are determined to take all necessary measures and actions needed to ensure the stability of the euro area. Since two years, we have taken steps to overcome the crisis but the immediate economic challenges are so serious that we must do more. All leaders agree to that," declared Herman Van Rompuy, President of the European Council, after the Euro Summit in Brussels on 23 October.

The Heads of State or Government of the euro area agreed on the objectives and outlined the strategy. They will conclude at the Euro Summit on 26 October.

President Van Rompuy mentioned the five fronts that the euro area is working on in the comprehensive strategy:

- action by all governments to ensure sustainable public finances and enhance growth. It means the full respect of agreed fiscal targets and an acceleration of structural reforms. "Between now and 26 October some members of the European Council will have to convince colleagues that their country implements the promised measures fully," said Herman Van Rompuy;
- working towards a solution with the private sector to improve sustainability as part of a new programme for Greece;
- a sufficient firewall against contagion by maximizing European Financial Stability Facility (EFSF) resources without extending the guarantees underpinning this facility. "Several options are being considered," informed President Van Rompuy;
- restoration of confidence in the European banking sector through a coordinated scheme to recapitalise the banks and to improve their funding. The agreement of the Finance Ministers will be finalised at the European Council on 26 October;
- better governance and stronger integration of the euro area. In the short term: improving organisation and strengthening fiscal and economic monitoring; in the medium term: stronger economic convergence, more efficient enforcement mechanisms and, ultimately, deeper fiscal integration.

"All the five elements are interrelated. Both technically and politically they are part of one single package. Further work is needed. That´s why we will take decisions at the follow-up Euro Summit," concluded Herman Van Rompuy.

Statement by the EC, ECB, and IMF on the Review Mission to Ireland


October 20, 2011
Staff teams from the European Commission (EC), European Central Bank (ECB), and International Monetary Fund (IMF) visited Dublin during October 11–20 for the regular quarterly review of the government’s economic programme. As envisaged when the mission was scheduled, policy discussions have been concluded with the exception of the specific fiscal measures to be included in Budget 2012, which are being determined by the Government and will be assessed by the three institutions in the coming weeks. Following these decisions, the EC and IMF missions will seek approval for the completion of this review from the European Council and the IMF Executive Board respectively.
Programme implementation continues to be strong. The authorities have completed the key initial phase of the comprehensive financial sector reforms launched in March. The fiscal deficit limit of 10.6 percent of GDP in 2011 is expected to be met and important structural reforms are being put in place. These strong policy efforts have underpinned the decline in Irish sovereign spreads in recent months, together with improved EU financing terms.
In a welcome sign of Ireland’s strengthened competitiveness, economic growth in the first half of 2011 was higher than expected. But the slowdown in key trading partners is likely to cool Ireland’s export growth. In addition, domestic demand is expected to contract slightly faster than was projected at the time of the previous review. Together, these factors will dampen the economic recovery with real GDP growth expected to be about 1 percent in both 2011 and 2012.
The authorities are firmly committed to fiscal consolidation to put the country’s debt on a downward path, by bringing the general government deficit to below 3 percent of GDP by 2015. The forthcoming 2012 Budget will make progress along that path by implementing sufficient consolidation to safely limit next year’s deficit to no more than 8.6 percent of GDP, striking a balance between debt reduction imperatives and limiting the drag on growth and job creation.
To underscore their commitment to sound fiscal policy, the authorities intend to update the medium-term fiscal consolidation plan in the coming weeks, with the supporting measures to be provided with the 2012 Budget. These measures will be guided by the authorities’ Comprehensive Review of Expenditure, enabling savings to be made in a targeted manner rather than through across-the-board cuts. We welcome the establishment of the Irish Fiscal Advisory Council and the release of its first fiscal assessment report.
The key initial phase of the comprehensive financial sector reforms launched last March has been implemented. Recapitalization of the banking sector has been completed at a lower than expected cost to the budget, benefiting from private investor participation and burden-sharing with the holders of subordinated bank debt. Deleveraging of the banking sector is progressing as planned, despite challenging conditions and banks have secured term funding reflecting improved confidence. Further progress in these areas is needed to allow banks to fulfill their essential role in the economy.
The authorities are implementing structural reforms to support job creation and growth. To help reduce unemployment sectoral wage agreements are being prepared, together with a strengthening of activation and training policies. Legislative changes are being introduced to enhance competition in the medical, legal and pharmacy sectors with the view to lowering costs.
The objectives of Ireland’s EU-IMF supported programme are to address financial sector weaknesses and to put Ireland’s economy on the path of sustainable growth, sound public finances, and job creation, while protecting the poor and most vulnerable. The programme includes loans from the European Union and EU member states amounting to €45.0 billion and a €22.5 billion Extended Fund Facility with the IMF. Ireland’s contribution is €17.5 billion. Approval of the conclusion of this review will allow the disbursement of €3.8billion by the IMF and €4.2 billion by the EU. The mission for the next program review is scheduled for January 2012.

European Union Commits EUR 14.6 million to Support IMF Capacity Building in Southern and Eastern Africa


October 17, 2011
The International Monetary Fund (IMF) and the European Union (EU) today expanded their partnership in support of IMF capacity building in Africa through the exchange of two Contribution Agreements totaling EUR 14.6 million (about US$20 million). The agreements, signed recently, will support the IMF’s Africa Regional Technical Assistance Centers for Eastern (AFRITAC East) and Southern Africa and the Indian Ocean region (AFRITAC South).
The IMF’s AFRITACs are widely considered models for effective capacity building in Africa. They assist recipient countries in their efforts to strengthen financial governance and build effective institutions. AFRITACs provide assistance critical to strengthening the public finances and reducing poverty, including debt and revenue management, and tax reform. They also support regional integration and provide a platform for donor coordination.
“We are delighted to expand our close partnership with the EU in support of our member countries in Eastern and Southern Africa, and are very grateful for its generous support for these two regional centers,” Deputy Managing Director Min Zhu said at the ceremony marking the exchange of the agreements in Mauritius, where AFRITAC South officially opened today. “We are expanding the AFRITAC network in response to a request by our African members, as the centers’ capacity building work is highly appreciated by beneficiary countries. Through its contribution, the EU is helping to build a success story here in Africa, as we have done already through our successful partnerships with the EU in our centers in the Middle East, Central America, Caribbean, and the Pacific,” Zhu added. “The AFRITACs are excellent vehicles for advancing regional integration and harmonization objectives, and we look forward to working closely with all relevant parties to support better integration among countries and with the global economy.”
The funding comes from the EU’s 10th European Development Fund (EDF) Regional Indicative Program for the Eastern and Southern Africa and Indian Ocean (ESA-IO) region. The program aims to support the integration agendas of regional organizations, strengthen regional cooperation, and support the region’s integration into the global economy. The project will assist countries as they institute reforms to improve tax administration and public finance management, standardize customs processes and procedures, reinforce the soundness of monetary frameworks and financial sectors, improve banking supervision, and strengthen data provision, thus facilitating private sector development to boost investment and growth and reduce poverty. The Indian Ocean Commission, with the assistance of the Interregional Coordination Committee, will assume a coordination role to ensure that technical assistance and training delivered through the centers are in line with the regional integration agenda.
"The EU support aims at contributing to the regional economic integration process of the ESA-IO region,” said Alessandro Mariani, Ambassador of the European Union in Mauritius. “The EU has experienced itself the benefits of regional integration and believes it is a key mechanism to foster growth and poverty reduction. We are pleased to enter into this partnership with the IMF that will contribute to create a macro-economic environment conducive to trade, investment and policy harmonization amongst the countries of the region."
Background Information
Demand for IMF technical assistance has risen in light of the global economic and financial crisis, but also because countries are seeking to strengthen their institutions. At the same time, the Fund is moving forward with a broad range of measures to respond more effectively to its members’ needs to deal with the emerging challenges of the global economy. To meet this rising demand as well as better coordinate assistance delivery, the IMF seeks to strengthen its partnerships with donors by engaging them on a broader, longer-term, and more strategic basis. As a part of these efforts, the IMF is expanding its network of Regional Technical Assistance Centers. It now has four centers in Africa, plus centers in the Pacific, Middle East, Central America and the Caribbean.
The Africa Regional Technical Assistance Centers (AFRITACs) are part of the IMF’s Africa Capacity-Building Initiative launched in May 2002. Responding to calls from African leaders, the Initiative promotes strengthening the capacity of African countries to design and implement their poverty-reducing strategies, as well as to improve the coordination of capacity-building technical assistance in this endeavor. As part of the Initiative, four centers have been established in Africa. AFRITAC East was opened in Dar Es Salaam, Tanzania, in 2002, and serves seven countries in East Africa. AFRITAC West was opened in Bamako, Mali, in 2003, and serves 10 countries in Francophone West Africa. AFRITAC Central was opened in Libreville, Gabon, in 2007, and serves nine countries in Central Africa. AFRITAC South started operations in June 2011 in Mauritius and covers 13 countries in Southern Africa and the Indian Ocean. Work is in progress to open a regional center in Ghana to cover non-Francophone countries in West Africa (AFRITAC West 2). This will complete coverage of all sub-Saharan countries through AFRITACs.
Complementing the regional perspective of the regional centers, topical trust funds provide technical assistance globally on specialized topics. A successful topical trust fund on Anti-Money Laundering/Combating the Financing of Terrorism was launched in May 2009 (see Press Release 09/108). New topical trust funds on Managing Natural Resource Wealth (Press Release No. 10/497), and on Tax Policy and Administration (Press Release No. 11/133) were launched in May 2011. Responding to the recent crisis, further topical trust funds are envisaged, including on sustainable debt strategies and managing debt portfolio risks.

Sunday, October 23, 2011

AIPAC Appreciates George Mitchell's Efforts at Peace


(U.S. President Barack Obama with Secretary of State Hillary Clinton and Sen. George Mitchell)

President Obama’s Middle East peace envoy, George Mitchell, has worked tirelessly to bring Israel and the Palestinians together in order to pave the way for the establishment of two states – one Jewish, one Palestinian - living side-by-side in peace and security. We appreciate his efforts to set up negotiations and deeply regret Palestinian Authority President Mahmoud Abbas’s continued unwillingness to negotiate directly with his Israeli counterpart without preconditions.
Mitchell understood and made clear to the parties that the only way to true peace is by sitting together and talking face-to-face in direct, bilateral negotiations. Rather than make peace with Israel, Abbas has elected to reconcile with Hamas, a U.S.-designated terrorist organization responsible for the death of countless civilians and unwilling to recognize the existence of the Jewish state.

Remarks by the President at a Reception Honoring Greek Independence Day


The White House
East Room

March 25, 2011 - 4:40 P.M. EDT

THE PRESIDENT: Well, good evening, everybody.

AUDIENCE: Good evening.

THE PRESIDENT: Kalispera. (Laughter.) Thank you, your Eminence, for the kind introduction. It is always an honor to welcome you here in the White House. We’ve been friends for quite some time now, and his Eminence always displays such grace and good humor and is so generous. We are so very grateful for your leadership.

It is a wonderful pleasure to see so many friends and leaders of the Hellenic American community here as we celebrate the 190th anniversary of Greek independence. (Applause.) I want to acknowledge several people. First of all, we’ve got some members of Congress here: Michael Grimm from New York. Where’s Michael? There he is. (Applause.) Carolyn Maloney, also from New York. (Applause.) John Sarbanes, from Maryland. (Applause.) And then we have another guy -- I don’t know if he’s any relation -- Paul Sarbanes, also of Maryland. (Applause.)

We’ve got Ambassador Demetrios Marantis, Deputy USTR. (Applause.) He’s got a few fans here. We’ve got Nicholas Karacostas -- (applause) -- the President of the American Hellenic Educational Progressive Association.

I want to especially welcome Deputy Foreign Minister Dollis for traveling all the way here from Athens to join us today. (Applause.) I spoke with your Prime Minister, our good friend Mr. Papandreou today, and I wanted him to extend our congratulations to the entire Greek nation. And we very much appreciate you being here to represent your government.

We are also joined here by Greek Ambassador Kaskarelis. Where is he? There he is. Good to see you, Mr. Ambassador. (Applause.) We have the Cypriot Ambassador -- (laughter) -- Anastasiades -- there you go -- (laughter) -- and his wife Maria. (Applause.)

Tonight we reaffirm the bond our two nations have shared for as long as we’ve existed. Our Founding Fathers were students of Greek philosophy and Greek history, drawing on Greek principles to guide our own nation in its earliest days.

When it was time for Greek revolutionaries to fight for freedom, they looked to the United States for strength and support. And to this day, the United States and Greece shares a bond rooted in common values and common ideals.

As allies, we stand together -– not only for our own security, but for the freedom of peoples around the world. Right now, Greek and American soldiers are serving together in Afghanistan. And as we celebrate the independence of the Greek people, the United States and Greece are standing with our NATO allies to support the Libyan people as they stand up for their own freedom.

So I just want to express the extraordinary thanks that I give to the people of Greece for their friendship, and for their contributions to the life of our nation and so many others. I also obviously want to say to all my great friends in the Greek American community, how much I appreciate your support and your friendship, and I’m glad that we have one more occasion to celebrate together here in the White House. So it’s wonderful to see you again, and I hope you guys have a great time today.

All right? Thank you very much, everybody. God bless you. (Applause.)

Thursday, October 20, 2011

CERN sets course for extra-low-energy antiprotons


Geneva, 28 September 2011. The kick-off meeting for ELENA, the Extra Low Energy Antiproton Ring, starts today at CERN1. Approved by CERN Council in June this year, ELENA is scheduled to deliver its first antiprotons in 2016. This week’s kick-off meeting brings together scientists from Canada, Denmark, France, Germany, Japan, Sweden, the UK and the USA. The project is led by CERN.

“ELENA is a new facility aimed to deliver antiprotons at the lowest energies ever reached in order to improve the study of antimatter,” said CERN’s Stéphan Maury, Head of the ELENA project.

ELENA will consist of a small new decelerator ring that will be installed in same building that houses CERN’s existing Antiproton Decelerator (AD). It will slow antiprotons down to under a fiftieth of the current AD energy, bringing an improvement of a factor of 10-100 in antiproton trapping efficiency. At the AD, antiprotons have to be slowed down by passing them through a series of foils, a process that results in the loss of some 99.9% of the antiprotons extracted from the AD before they reach the experiments.

“This is a big step forward for antimatter physics. Going to extra low energy increases the trapping efficiency for antiprotons, which will not only improve the research potential of existing experiments, but will also allow CERN to support a wider range of antimatter experiments,” said Walter Oelert, an antimatter pioneer at CERN, who has actively supported the ELENA project.

Ever since the Nobel Prize winning discovery of antiprotons in 1955, these particles have proved to be an important research tool. In the 1980s, they played a pivotal role in the discovery of the W and Z particles at CERN, which also led to a Nobel Prize.

CERN’s achievements with low-energy antiprotons include the trapping and accumulation of large numbers of antiprotons in the early 1990s, which led to very precise comparisons of protons and antiprotons. In 1995, the first antiatoms - antihydrogen - were created at CERN, opening the way to new experiments on antimatter and, more recently, the trapping of antihydrogen atoms. One experiment at the AD has also made preliminary studies of the potential for using antiprotons in cancer therapy. In the future, experiments will make detailed comparisons of hydrogen and antihydrogen atoms, and measure the influence of gravity on antihydrogen.

Construction of ELENA is scheduled to begin in 2013, in parallel with AD running. When complete in 2016, ELENA will be able to support more experiments than the AD can today, giving CERN - a laboratory best known for the high-energy frontier of particle physics - a grandstand seat at the low-energy frontier.

Sunday, October 16, 2011

NASA Continues Critical Survey Of Antarctica's Changing Ice



WASHINGTON -- Scientists with NASA's Operation IceBridge airborne research campaign began the mission's third year of surveys this week over the changing ice of Antarctica.

Researchers are flying a suite of scientific instruments on two planes from a base of operations in Punta Arenas, Chile: a DC-8 operated by NASA and a Gulfstream V (G-V) operated by the National Science Foundation and the National Center for Atmospheric Research. The G-V will fly through early November. The DC-8, which completed its first science flight Oct. 12, will fly through mid-November.

Ninety-eight percent of Antarctica is covered in ice. Scientists are concerned about how quickly key features are thinning, such as Pine Island Glacier, which rests on bedrock below sea level. Better understanding this type of change is crucial to projecting impacts like sea-level rise.

"With a third year of data-gathering underway, we are starting to build our own record of change," said Michael Studinger, IceBridge project scientist at NASA's Goddard Space Flight Center in Greenbelt, Md. "With IceBridge, our aim is to understand what the world's major ice sheets could contribute to sea-level rise. To understand that you have to record how ice sheets and glaciers are changing over time."

IceBridge science flights put a variety of remote-sensing instruments above Antarctica's land and sea ice, and in some regions, above the ocean floor. The G-V carries one instrument: a laser-ranging topography mapper. The DC-8 carries seven instruments, including a laser altimeter to continue the crucial ice sheet elevation record begun by the Ice, Cloud and land Elevation Satellite (ICESat) mission, which ended in 2009. The flying laboratory also will carry radars that can distinguish how much snow sits on top of sea ice and map the terrain of bedrock below thick ice cover.

While scientists in recent years have produced newer, more detailed data about the ice sheet's surface, the topography of the rocky surface beneath the ice sheet remains unknown in many places. Without knowing the topography of the bedrock, it is impossible to know exactly how much ice sits on top of Antarctica.

A gravimeter aboard the DC-8 will detect subtle differences in gravity to map the ocean floor beneath floating ice shelves. Data on bathymetry, or ocean depth, and ocean circulation from previous IceBridge campaigns are helping explain why some glaciers are changing so quickly.

Flights take off from Punta Arenas and cross the Southern Ocean to reach destinations including West Antarctica, the Antarctic Peninsula and coastal areas. Each lasts 10 to 11 hours.

"We will be re-surveying our previous flight lines to see how much glaciers and ice sheets have changed, and we'll cover new areas to establish a baseline for future years and the ICESat-2 mission in 2016," Studinger said.

Early high-priority DC-8 flights include several flight lines over sea ice near the Antarctic Peninsula, before too much of the ice melts in the southern spring. IceBridge sea ice flights are designed to help scientists understand why sea ice in the Southern Hemisphere is not following the steady decline of sea ice thickness and extent seen in the Arctic.

Other high priority flight lines follow ground traverses being made this year and next, during which NASA scientists will travel different sections of the West Antarctic Ice Sheet, measuring snowfall accumulation and the characteristics of Pine Island Glacier.

Many flight lines will retrace either previous ICESat-1 tracks or future ICESat-2 tracks. Some also will align with current observations made by the European Space Agency's CryoSat-2 satellite. The overlapping flight lines and satellite tracks ultimately will help scientists improve the accuracy of their data.

NASA's Ames Research Center in Moffett Field, Calif., is responsible for IceBridge project management. The DC-8 is based at NASA's Dryden Aircraft Operations Facility in Palmdale, Calif.

President Barack Obama on Space Exploration in the 21st Century


THE WHITE HOUSE
Office of the Press Secretary
REMARKS BY THE PRESIDENT
ON SPACE EXPLORATION IN THE 21ST CENTURY

John F. Kennedy Space Center
Merritt Island, Florida

2:55 P.M. EDT

THE PRESIDENT: Thank you, everybody. Thank you. (Applause.) Thank you so much. Thank you, everybody. Please have a seat. Thank you.

I want to thank Senator Bill Nelson and NASA Administrator Charlie Bolden for their extraordinary leadership. I want to recognize Dr. Buzz Aldrin as well, who’s in the house. (Applause.) Four decades ago, Buzz became a legend. But in the four decades since he’s also been one of America’s leading visionaries and authorities on human space flight.

Few people -- present company excluded -- can claim the expertise of Buzz and Bill and Charlie when it comes to space exploration. I have to say that few people are as singularly unimpressed by Air Force One as those three. (Laughter.) Sure, it’s comfortable, but it can’t even reach low Earth orbit. And that obviously is in striking contrast to the Falcon 9 rocket we just saw on the launch pad, which will be tested for the very first time in the coming weeks.

A couple of other acknowledgments I want to make. We’ve got Congresswoman Sheila Jackson Lee from Texas visiting us, a big supporter of the space program. (Applause.) My director, Office of Science and Technology Policy -- in other words my chief science advisor -- John Holdren is here. (Applause.) And most of all I want to acknowledge your congresswoman Suzanne Kosmas, because every time I meet with her, including the flight down here, she reminds me of how important our NASA programs are and how important this facility is. And she is fighting for every single one of you and for her district and for the jobs in her district. And you should know that you’ve got a great champion in Congresswoman Kosmas. Please give her a big round of applause. (Applause.)

I also want to thank everybody for participating in today’s conference. And gathered here are scientists, engineers, business leaders, public servants, and a few more astronauts as well. Last but not least, I want to thank the men and women of NASA for welcoming me to the Kennedy Space Center, and for your contributions not only to America, but to the world.

Here at the Kennedy Space Center we are surrounded by monuments and milestones of those contributions. It was from here that NASA launched the missions of Mercury and Gemini and Apollo. It was from here that Space Shuttle Discovery, piloted by Charlie Bolden, carried the Hubble Telescope into orbit, allowing us to plumb the deepest recesses of our galaxy. And I should point out, by the way, that in my private office just off the Oval, I’ve got the picture of Jupiter from the Hubble. So thank you, Charlie, for helping to decorate my office. (Laughter.) It was from here that men and women, propelled by sheer nerve and talent, set about pushing the boundaries of humanity’s reach.

That’s the story of NASA. And it’s a story that started a little more than half a century ago, far from the Space Coast, in a remote and desolate region of what is now called Kazakhstan. Because it was from there that the Soviet Union launched Sputnik, the first artificial satellite to orbit the Earth, which was little more than a few pieces of metal with a transmitter and a battery strapped to the top of a missile. But the world was stunned. Americans were dumbfounded. The Soviets, it was perceived, had taken the lead in a race for which we were not yet fully prepared.

But we caught up very quick. President Eisenhower signed legislation to create NASA and to invest in science and math education, from grade school to graduate school. In 1961, President Kennedy boldly declared before a joint session of Congress that the United States would send a man to the Moon and return him safely to the Earth within the decade. And as a nation, we set about meeting that goal, reaping rewards that have in the decades since touched every facet of our lives. NASA was at the forefront. Many gave their careers to the effort. And some have given far more.

In the years that have followed, the space race inspired a generation of scientists and innovators, including, I’m sure, many of you. It’s contributed to immeasurable technological advances that have improved our health and well-being, from satellite navigation to water purification, from aerospace manufacturing to medical imaging. Although, I have to say, during a meeting right before I came out on stage somebody said, you know, it’s more than just Tang -- and I had to point out I actually really like Tang. (Laughter.) I thought that was very cool.

And leading the world to space helped America achieve new heights of prosperity here on Earth, while demonstrating the power of a free and open society to harness the ingenuity of its people.

And on a personal note, I have been part of that generation so inspired by the space program. 1961 was the year of my birth -- the year that Kennedy made his announcement. And one of my earliest memories is sitting on my grandfather’s shoulders, waving a flag as astronauts arrived in Hawaii. For me, the space program has always captured an essential part of what it means to be an American -- reaching for new heights, stretching beyond what previously did not seem possible. And so, as President, I believe that space exploration is not a luxury, it’s not an afterthought in America’s quest for a brighter future -- it is an essential part of that quest.

So today, I’d like to talk about the next chapter in this story. The challenges facing our space program are different, and our imperatives for this program are different, than in decades past. We’re no longer racing against an adversary. We’re no longer competing to achieve a singular goal like reaching the Moon. In fact, what was once a global competition has long since become a global collaboration. But while the measure of our achievements has changed a great deal over the past 50 years, what we do -- or fail to do -- in seeking new frontiers is no less consequential for our future in space and here on Earth.

So let me start by being extremely clear: I am 100 percent committed to the mission of NASA and its future. (Applause.) Because broadening our capabilities in space will continue to serve our society in ways that we can scarcely imagine. Because exploration will once more inspire wonder in a new generation -- sparking passions and launching careers. And because, ultimately, if we fail to press forward in the pursuit of discovery, we are ceding our future and we are ceding that essential element of the American character.

I know there have been a number of questions raised about my administration’s plan for space exploration, especially in this part of Florida where so many rely on NASA as a source of income as well as a source of pride and community. And these questions come at a time of transition, as the space shuttle nears its scheduled retirement after almost 30 years of service. And understandably, this adds to the worries of folks concerned not only about their own futures but about the future of the space program to which they’ve devoted their lives.

But I also know that underlying these concerns is a deeper worry, one that precedes not only this plan but this administration. It stems from the sense that people in Washington -- driven sometimes less by vision than by politics -- have for years neglected NASA’s mission and undermined the work of the professionals who fulfill it. We’ve seen that in the NASA budget, which has risen and fallen with the political winds.

But we can also see it in other ways: in the reluctance of those who hold office to set clear, achievable objectives; to provide the resources to meet those objectives; and to justify not just these plans but the larger purpose of space exploration in the 21st century.

All that has to change. And with the strategy I’m outlining today, it will. We start by increasing NASA’s budget by $6 billion over the next five years, even -- (applause) -- I want people to understand the context of this. This is happening even as we have instituted a freeze on discretionary spending and sought to make cuts elsewhere in the budget.

So NASA, from the start, several months ago when I issued my budget, was one of the areas where we didn’t just maintain a freeze but we actually increased funding by $6 billion. By doing that we will ramp up robotic exploration of the solar system, including a probe of the Sun’s atmosphere; new scouting missions to Mars and other destinations; and an advanced telescope to follow Hubble, allowing us to peer deeper into the universe than ever before.

We will increase Earth-based observation to improve our understanding of our climate and our world -- science that will garner tangible benefits, helping us to protect our environment for future generations.

And we will extend the life of the International Space Station likely by more than five years, while actually using it for its intended purpose: conducting advanced research that can help improve the daily lives of people here on Earth, as well as testing and improving upon our capabilities in space. This includes technologies like more efficient life support systems that will help reduce the cost of future missions. And in order to reach the space station, we will work with a growing array of private companies competing to make getting to space easier and more affordable. (Applause.)

Now, I recognize that some have said it is unfeasible or unwise to work with the private sector in this way. I disagree. The truth is, NASA has always relied on private industry to help design and build the vehicles that carry astronauts to space, from the Mercury capsule that carried John Glenn into orbit nearly 50 years ago, to the space shuttle Discovery currently orbiting overhead. By buying the services of space transportation -- rather than the vehicles themselves -- we can continue to ensure rigorous safety standards are met. But we will also accelerate the pace of innovations as companies -- from young startups to established leaders -- compete to design and build and launch new means of carrying people and materials out of our atmosphere.

In addition, as part of this effort, we will build on the good work already done on the Orion crew capsule. I’ve directed Charlie Bolden to immediately begin developing a rescue vehicle using this technology, so we are not forced to rely on foreign providers if it becomes necessary to quickly bring our people home from the International Space Station. And this Orion effort will be part of the technological foundation for advanced spacecraft to be used in future deep space missions. In fact, Orion will be readied for flight right here in this room. (Applause.)

Next, we will invest more than $3 billion to conduct research on an advanced “heavy lift rocket” -- a vehicle to efficiently send into orbit the crew capsules, propulsion systems, and large quantities of supplies needed to reach deep space. In developing this new vehicle, we will not only look at revising or modifying older models; we want to look at new designs, new materials, new technologies that will transform not just where we can go but what we can do when we get there. And we will finalize a rocket design no later than 2015 and then begin to build it. (Applause.) And I want everybody to understand: That’s at least two years earlier than previously planned -- and that’s conservative, given that the previous program was behind schedule and over budget.

At the same time, after decades of neglect, we will increase investment -- right away -- in other groundbreaking technologies that will allow astronauts to reach space sooner and more often, to travel farther and faster for less cost, and to live and work in space for longer periods of time more safely. That means tackling major scientific and technological challenges. How do we shield astronauts from radiation on longer missions? How do we harness resources on distant worlds? How do we supply spacecraft with energy needed for these far-reaching journeys? These are questions that we can answer and will answer. And these are the questions whose answers no doubt will reap untold benefits right here on Earth.

So the point is what we’re looking for is not just to continue on the same path -- we want to leap into the future; we want major breakthroughs; a transformative agenda for NASA. (Applause.)

Now, yes, pursuing this new strategy will require that we revise the old strategy. In part, this is because the old strategy -- including the Constellation program -- was not fulfilling its promise in many ways. That’s not just my assessment; that’s also the assessment of a panel of respected non-partisan experts charged with looking at these issues closely. Now, despite this, some have had harsh words for the decisions we’ve made, including some individuals who I’ve got enormous respect and admiration for.

But what I hope is, is that everybody will take a look at what we are planning, consider the details of what we’ve laid out, and see the merits as I’ve described them. The bottom line is nobody is more committed to manned space flight, to human exploration of space than I am. (Applause.) But we’ve got to do it in a smart way, and we can’t just keep on doing the same old things that we’ve been doing and thinking that somehow is going to get us to where we want to go.

Some have said, for instance, that this plan gives up our leadership in space by failing to produce plans within NASA to reach low Earth orbit, instead of relying on companies and other countries. But we will actually reach space faster and more often under this new plan, in ways that will help us improve our technological capacity and lower our costs, which are both essential for the long-term sustainability of space flight. In fact, through our plan, we’ll be sending many more astronauts to space over the next decade. (Applause.)

There are also those who criticized our decision to end parts of Constellation as one that will hinder space exploration below [sic] low Earth orbit. But it’s precisely by investing in groundbreaking research and innovative companies that we will have the potential to rapidly transform our capabilities -- even as we build on the important work already completed, through projects like Orion, for future missions. And unlike the previous program, we are setting a course with specific and achievable milestones.

Early in the next decade, a set of crewed flights will test and prove the systems required for exploration beyond low Earth orbit. (Applause.) And by 2025, we expect new spacecraft designed for long journeys to allow us to begin the first-ever crewed missions beyond the Moon into deep space. (Applause.) So we’ll start -- we’ll start by sending astronauts to an asteroid for the first time in history. (Applause.) By the mid-2030s, I believe we can send humans to orbit Mars and return them safely to Earth. And a landing on Mars will follow. And I expect to be around to see it. (Applause.)

But I want to repeat -- I want to repeat this: Critical to deep space exploration will be the development of breakthrough propulsion systems and other advanced technologies. So I’m challenging NASA to break through these barriers. And we’ll give you the resources to break through these barriers. And I know you will, with ingenuity and intensity, because that’s what you’ve always done. (Applause.)

Now, I understand that some believe that we should attempt a return to the surface of the Moon first, as previously planned. But I just have to say pretty bluntly here: We’ve been there before. Buzz has been there. There’s a lot more of space to explore, and a lot more to learn when we do. So I believe it’s more important to ramp up our capabilities to reach -- and operate at -- a series of increasingly demanding targets, while advancing our technological capabilities with each step forward. And that’s what this strategy does. And that’s how we will ensure that our leadership in space is even stronger in this new century than it was in the last. (Applause.)

Finally, I want to say a few words about jobs. Suzanne pointed out to me that the last time I was here, I made a very clear promise that I would help in the transition into a new program to make sure that people who are already going through a tough time here in this region were helped. And despite some reports to the contrary, my plan will add more than 2,500 jobs along the Space Coast in the next two years compared to the plan under the previous administration. So I want to make that point. (Applause.)

We’re going to modernize the Kennedy Space Center, creating jobs as we upgrade launch facilities. And there’s potential for even more jobs as companies in Florida and across America compete to be part of a new space transportation industry. And some of those industry leaders are here today. This holds the promise of generating more than 10,000 jobs nationwide over the next few years. And many of these jobs will be created right here in Florida because this is an area primed to lead in this competition.

Now, it’s true -- there are Floridians who will see their work on the shuttle end as the program winds down. This is based on a decision that was made six years ago, not six months ago, but that doesn’t make it any less painful for families and communities affected as this decision becomes reality.

So I’m proposing -- in part because of strong lobbying by Bill and by Suzanne, as well as Charlie -- I’m proposing a $40 million initiative led by a high-level team from the White House, NASA, and other agencies to develop a plan for regional economic growth and job creation. And I expect this plan to reach my desk by August 15th. (Applause.) It’s an effort that will help prepare this already skilled workforce for new opportunities in the space industry and beyond.

So this is the next chapter that we can write together here at NASA. We will partner with industry. We will invest in cutting-edge research and technology. We will set far-reaching milestones and provide the resources to reach those milestones. And step by step, we will push the boundaries not only of where we can go but what we can do.

Fifty years after the creation of NASA, our goal is no longer just a destination to reach. Our goal is the capacity for people to work and learn and operate and live safely beyond the Earth for extended periods of time, ultimately in ways that are more sustainable and even indefinite. And in fulfilling this task, we will not only extend humanity’s reach in space -- we will strengthen America’s leadership here on Earth.

Now, I’ll close by saying this. I know that some Americans have asked a question that’s particularly apt on Tax Day: Why spend money on NASA at all? Why spend money solving problems in space when we don’t lack for problems to solve here on the ground? And obviously our country is still reeling from the worst economic turmoil we’ve known in generations. We have massive structural deficits that have to be closed in the coming years.

But you and I know this is a false choice. We have to fix our economy. We need to close our deficits. But for pennies on the dollar, the space program has fueled jobs and entire industries. For pennies on the dollar, the space program has improved our lives, advanced our society, strengthened our economy, and inspired generations of Americans. And I have no doubt that NASA can continue to fulfill this role. (Applause.) But that is why -- but I want to say clearly to those of you who work for NASA, but to the entire community that has been so supportive of the space program in this area: That is exactly why it’s so essential that we pursue a new course and that we revitalize NASA and its mission -- not just with dollars, but with clear aims and a larger purpose.

Now, little more than 40 years ago, astronauts descended the nine-rung ladder of the lunar module called Eagle, and allowed their feet to touch the dusty surface of the Earth’s only Moon. This was the culmination of a daring and perilous gambit -- of an endeavor that pushed the boundaries of our knowledge, of our technological prowess, of our very capacity as human beings to solve problems. It wasn’t just the greatest achievement in NASA’s history -- it was one of the greatest achievements in human history.

And the question for us now is whether that was the beginning of something or the end of something. I choose to believe it was only the beginning.

So thank you. God bless you. And may God bless the United States of America. Thank you. (Applause.)

END 3:21 P.M. EDT
April 15, 2010

Thursday, October 13, 2011

Giant Webb Space Telescope Model to "Land" in Baltimore


Baltimore's Maryland Science Center is going to be the "landing site" for the life- sized, full-scale model of NASA's James Webb Space Telescope, and it's free for all to see.

The Webb telescope life-sized model is as big as a tennis court, and it's coming to the Maryland Science Center at Baltimore's Inner Harbor from October 14 through 26, 2011. It's a chance for young and old to get a close-up look at the successor to the Hubble Space Telescope in the same size it will be launched into space.

The real James Webb Space Telescope is currently being built, but this model will be constructed in a couple of days. The real Webb will be the largest space telescope ever built. Once in orbit, the Webb telescope will look back in time more than 13 billion years to help us understand the formation of galaxies, stars, and planets.

This photo composite is a depiction of the Webb full-scale model at the Maryland Science Center at Baltimore's Inner Harbor. The model is constructed mainly of aluminum and steel, weighs 12,000 pounds, and is approximately 80 feet long, 40 feet wide, and 40 feet tall. The model requires two trucks to ship it, and assembly takes a crew of 12 approximately four days.

Space Telescopes Reveal Secrets of Turbulent Black Hole


A fleet of spacecraft including NASA's Hubble Space Telescope has uncovered unprecedented details in the surroundings of a supermassive black hole. Observations reveal huge bullets of gas being driven away from the gravitational monster and a corona of very hot gas hovering above the disk of matter that is falling into the black hole.

A team led by Jelle Kaastra of SRON Netherlands Institute for Space Research made use of data from ESA's XMM-Newton and INTEGRAL spacecraft (which study X-rays and gamma rays, respectively), the Hubble Space Telescope (for ultraviolet observations with the COS instrument), and NASA's Chandra (X-ray) Observatory and Swift (gamma-ray) satellites.

The black hole that the team chose to study lies at the heart of the galaxy Markarian 509 (Mrk 509), 500 million light-years away. This black hole is colossal, containing 300 million times the mass of the Sun, and is growing more massive every day as it continues to feed on surrounding matter, which glows brightly as it forms a rotating disk around the black hole. Mrk 509 was chosen because it is known to vary in brightness, which indicates that the flow of matter is turbulent.

This image of Mrk 509 was taken in April 2007 with Hubble's Wide Field Planetary Camera 2. But using a large number of telescopes that are sensitive to different wavelengths of light gave astronomers unprecedented coverage running from the infrared, through the visible, ultraviolet, X-rays, and into the gamma-ray band.

The study is presented in a series of seven papers in the journal Astronomy and Astrophysics, with more expected to be published in coming months.

A full account of the research can be read on the SRON website at http://www.sron.nl .

Ambitious Hubble Survey Obtaining New Dark Matter Census


This image of galaxy cluster MACS J1206.2-0847 (or MACS 1206 for short) is part of a broad survey with NASA's Hubble Space Telescope.

The distorted shapes in the cluster are distant galaxies from which the light is bent by the gravitational pull of an invisible material called dark matter within the cluster of galaxies. This cluster is an early target in a survey that will allow astronomers to construct the most detailed dark matter maps of more galaxy clusters than ever before.

These maps are being used to test previous, but surprising, results that suggest that dark matter is more densely packed inside clusters than some models predict. This might mean that galaxy cluster assembly began earlier than commonly thought.

The multiwavelength survey, called the Cluster Lensing And Supernova survey with Hubble (CLASH), probes, with unparalleled precision, the distribution of dark matter in 25 massive clusters of galaxies. So far, the CLASH team has completed observations of six of the 25 clusters.

Dark matter makes up the bulk of the universe's mass, yet it can only be detected by measuring how its gravity tugs on visible matter and warps space like a fun-house mirror so that the light from distant objects is distorted.

Galaxy clusters like MACS 1206 are perfect laboratories for studying dark matter's gravitational effects because they are the most massive structures in the universe. Because of their heft, the clusters act like giant cosmic lenses, magnifying, distorting and bending any light that passes through them — an effect known as gravitational lensing.

Lensing effects can also produce multiple images of the same distant object, as evident in this Hubble picture. In particular, the apparent numbers and shapes of distant galaxies far beyond a galaxy cluster become distorted as the light passes through, yielding a visible measurement of how much mass is in the intervening cluster and how it is distributed. The substantial lensing distortions seen are proof that the dominant component of clusters is dark matter. The distortions would be far weaker if the clusters' gravity came only from the visible galaxies in the clusters.

MACS 1206 lies 4.5 billion light-years from Earth. Hubble's keen vision helped CLASH astronomers uncover 47 multiple images of 12 newly identified faraway galaxies. Finding so many multiple images in a cluster is a unique capability of Hubble, and the CLASH survey is optimized to find them. The new observations build on earlier work by Hubble and ground-based telescopes.

Taking advantage of two of Hubble's powerful cameras, the Advanced Camera for Surveys and the Wide Field Camera 3, the CLASH survey covers a broad wavelength range, from ultraviolet to near infrared. Astronomers need the diverse colors to estimate the distances to lensed galaxies and study them in more detail. Hubble's unique capabilities allow astronomers to estimate distances to galaxies that are four times fainter than ground-based telescopes can see.

The era when the first clusters formed is not precisely known, but is estimated to be at least 9 billion years ago and possibly as far back as 12 billion years ago. If most of the clusters in the CLASH survey are found to have excessively high accumulations of dark matter in their central cores, then it may yield new clues to the early stages in the origin of structure in the universe.

Future telescopes like NASA's James Webb Space Telescope, a space-based infrared observatory now being built, will be able to study the fainter lensed galaxies in clusters like MACS 1206 in greater detail. Webb will be powerful enough to collect the spectra of some of the magnified galaxies to study their early chemical composition.

Astrophysicist Adam Riess Wins the 2011 Nobel Prize in Physics


News release from NASA:
Observations made by NASA's Hubble Space Telescope of a special type of supernovae contributed to research on the expansion of the universe that today was honored with the 2011 Nobel Prize in Physics.

Adam Riess, an astronomer at the Space Telescope Science Institute and Krieger-Eisenhower professor in physics and astronomy at The Johns Hopkins University in Baltimore, was a member of a team awarded the Nobel Prize in Physics by the Royal Swedish Academy of Sciences. The academy recognized him for leadership in the High-z Team's 1998 discovery that the expansion rate of the universe is accelerating, a phenomenon widely attributed to a mysterious, unexplained "dark energy" filling the universe. Critical parts of the work were done with NASA's Hubble Space Telescope.

Riess shares the prize with Saul Perlmutter, an astrophysicist at the University of California, Berkeley, and the Lawrence Berkeley National Laboratory, whose Supernova Cosmology Project team published similar results shortly after those published by Riess and High-z teammate Brian Schmidt of the Australian National University. Both teams shared the Peter Gruber Foundation's 2007 Cosmology Prize — a gold medal and $500,000 — for the discovery of dark energy, which Science Magazine called "The Breakthrough Discovery of the Year" in 1998.

"The work of Reiss and others has completely transformed our understanding of the universe," said Waleed Abdalati, NASA chief scientist. "This award also recognizes the tremendous contributions of the technological community that engineered, deployed, and serviced the Hubble Space Telescope, which continues to open new doors to discovery after more than 20 years of peering deep into the universe. With the future launch of the even more powerful James Webb Space Telescope, NASA is ensuring more revolutionary science discoveries like these in our future."

Space Telescope Science Institute director Matt Mountain added, "The power of this discovery is that NASA has kept Hubble going for 20 years. This meant that Adam was able to track the history of the universe using science instruments that were upgraded from one servicing mission to the next. That is why this work has been recognized with the Nobel Prize."

Riess led the study for the High-z Supernova Search Team of highly difficult and precise measurements of objects spanning 7 billion light-years that resulted in the 1998 discovery that many believe has changed astrophysics forever: an accelerated expansion of the universe propelled by dark energy.

"We originally set out to use a special kind of exploding star called 'supernovae' to measure how fast the universe was expanding in the past and to compare it to how fast it is expanding now," Riess recalled. "We anticipated finding that gravity had slowed the rate of expansion over time. But that's not what we found." Instead, Riess' team was startled to discern that the rate of expansion was actually speeding up.

Richard Griffiths, Hubble program scientist in the Astrophysics Division at NASA Headquarters, Washington, said, "The role of the Hubble Space Telescope in this work was to measure how the brightness of some of the most distant supernovae changed over time. This established the acceleration of the universe and by inference that the agent of acceleration is 'dark energy.'"

The importance of Hubble was to obtain images of the high-redshift supernovae of type Ia, exploding white dwarfs that have accreted gas from their companion stars in a binary system and reached a mass limit beyond which they can no longer support themselves against gravity. Since the brightness of these supernovae change with time in a way that correlates with their intrinsic peak brightness, observations of their light can point to how bright, and therefore how distant, their host galaxies are.

The precision of Hubble measurements of the high redshift supernovae, which had been discovered from the ground, was crucial in the demonstration that distant supernovae were fainter than expected, and that the initial deceleration of the universe has astoundingly transformed into an accelerating expansion due to the effects of dark energy.

Although Hubble played a critical role in the discovery of dark energy, nearly every major observatory on Earth also contributed to the study of this mysterious energy. Ground-based telescopes run by the National Optical Astronomy Observatories, especially the 4-meter Blanco telescope at the Cerro Tololo International Observatory in Chile, and at the Kitt Peak National Observatory in Arizona, as well as European telescopes on the Canary Islands, are credited with discovering of the majority of the supernovae ultimately used to track the expansion rate of the universe. The astronomers also used the W. M. Keck Observatory in Hawaii, the MMT Observatory in Arizona, and European Southern Observatory's 3.6-meter telescope in Chile to measure the spectra of the discovered supernovae and the distances of their host galaxies.

"One of the most exciting things about dark energy is that it seems to live at the very nexus of two of our most successful theories of physics: quantum mechanics, which explains the physics of the small, and Einstein's Theory of General Relativity, which explains the physics of the large, including gravity," Reiss said.

"Currently, physicists have to choose between those two theories when they calculate something. Dark energy is giving us a peek into how to make those two theories operate together. Nature somehow must know how to bring these both together, and it is giving us some important clues. It's up to us to figure out what [those clues] are saying."

Riess is continuing his Hubble Space Telescope observations of distant supernovae to characterize dark energy. He also is involved in searching for the exploding stars with the Panoramic Survey Telescope and Rapid Response System, a series of ground-based telescopes at the University of Hawaii's Institute for Astronomy. The sky survey is expected to find thousands of new supernovae.

Other Space Telescope Science Institute staff involved in the dark energy research are Ron Gilliland, a co-investigator with Riess, and Andrew Fruchter, Nino Panagia, and Susana Deustua who were on Perlmutter's team.

The Hubble Space Telescope is a project of international cooperation between NASA and the European Space Agency. NASA's Goddard Space Flight Center manages the telescope. The Space Telescope Science Institute conducts Hubble science operations and is operated for NASA by the Association of Universities for Research in Astronomy, Inc.
Related Posts Plugin for WordPress, Blogger...