Sep 15 2011
From The Space Library
RELEASE: 11-302 NASA TEAM HONORED FOR ASSISTING CHILEAN MINER RESCUE
NASA Administrator Charles Bolden, right, presents the National Security and International Affairs Medal to Michael Duncan, former deputy chief medical officer at NASA's Johnson Space Center in Houston, Thursday evening, Sept. 15, 2011, at the 2011 Samuel J. Heyman Service to America Medals, or Sammies, gala in Washington. Duncan was joined by J.D. Polk, also a medical doctor, and Clinton Cragg. The NASA team, who provided medical, survival and engineering expertise to help the miners trapped underground in Chile last year, received the National Security and International Affairs Medal from the nonprofit Partnership for Public Service. The team -- led by Michael Duncan, former deputy chief medical officer at NASA's Johnson Space Center in HOUSTON --was recognized at the Samuel J. Heyman Service to America Medals, or Sammies, gala in Washington on Thursday. "We are very proud of the NASA team for its contribution that earned this prestigious award," NASA Administrator Charles Bolden said. "The help provided to the Chilean government is a testament to the research and technology development we do at NASA. This was a practical example of how science and engineering for the space program has direct benefits to people on Earth." After the Chilean government requested technical advice in August 2010, the NASA team spent three days at the rescue site in Copiapo, Chile. Duncan was joined by J.D. Polk, also a medical doctor, Albert Holland, and Clinton Cragg. Duncan works in the Office of International and Interagency Relations at NASA Headquarters in Washington. Polk is the chief of the Space Medicine Division at Johnson. Holland is a senior operational psychologist with the NASA Behavioral Health and Performance Group at Johnson. Cragg is a principal engineer in the NASA Engineering and Safety Center located at the agency's Langley Research Center in Hampton, Va. More than 400 nominations were submitted for the 2011 medals. A committee of leaders in government, academia, the private sector, media and philanthropy selected the winners. The gala was hosted by Bob Schieffer, CBS News chief Washington correspondent and moderator of "Face the Nation."
RELEASE: 11-304 NASA'S Kepler DISCOVERY CONFIRMS FIRST PLANET ORBITING TWO STARS
WASHINGTON -- The existence of a world with a double sunset, as portrayed in the film Star Wars more than 30 years ago, is now scientific fact. NASA's Kepler mission has made the first unambiguous detection of a circumbinary planet -- a planet orbiting two stars -- 200 light-years from Earth. Unlike Star Wars' Tatooine, the planet is cold, gaseous and not thought to harbor life, but its discovery demonstrates the diversity of planets in our galaxy. Previous research has hinted at the existence of circumbinary planets, but clear confirmation proved elusive. Kepler detected such a planet, known as Kepler-16b, by observing transits, where the brightness of a parent star dims from the planet crossing in front of it. "This discovery confirms a new class of planetary systems that could harbor life," Kepler principal investigator William Borucki said. "Given that most stars in our galaxy are part of a binary system, this means the opportunities for life are much broader than if planets form only around single stars. This milestone discovery confirms a theory that scientists have had for decades but could not prove until now." A research team led by Laurance Doyle of the SETI Institute in Mountain View, Calif., used data from the Kepler space telescope, which measures dips in the brightness of more than 150,000 stars, to search for transiting planets. Kepler is the first NASA mission capable of finding Earth-size planets in or near the "habitable zone," the region in a planetary system where liquid water can exist on the surface of the orbiting planet. Scientists detected the new planet in the Kepler-16 system, a pair of orbiting stars that eclipse each other from our vantage point on Earth. When the smaller star partially blocks the larger star, a primary eclipse occurs, and a secondary eclipse occurs when the smaller star is occulted, or completely blocked, by the larger star. Astronomers further observed that the brightness of the system dipped even when the stars were not eclipsing one another, hinting at a third body. The additional dimming in brightness events, called the tertiary and quaternary eclipses, reappeared at irregular intervals of time, indicating the stars were in different positions in their orbit each time the third body passed. This showed the third body was circling, not just one, but both stars, in a wide circumbinary orbit. The gravitational tug on the stars, measured by changes in their eclipse times, was a good indicator of the mass of the third body. Only a very slight gravitational pull was detected, one that only could be caused by a small mass. The findings are described in a new study published Friday, Sept. 16, in the journal Science. "Most of what we know about the sizes of stars comes from such eclipsing binary systems, and most of what we know about the size of planets comes from transits," said Doyle, who also is the lead author and a Kepler participating scientist. "Kepler-16 combines the best of both worlds, with stellar eclipses and planetary transits in one system." This discovery confirms that Kepler-16b is an inhospitable, cold world about the size of Saturn and thought to be made up of about half rock and half gas. The parent stars are smaller than our sun. One is 69 percent the mass of the sun and the other only 20 percent. Kepler-16b orbits around both stars every 229 days, similar to Venus' 225-day orbit, but lies outside the system's habitable zone, where liquid water could exist on the surface, because the stars are cooler than our sun. "Working in film, we often are tasked with creating something never before seen," said visual effects supervisor John Knoll of Industrial Light & Magic, a division of Lucasfilm Ltd., in San Francisco. "However, more often than not, scientific discoveries prove to be more spectacular than anything we dare imagine. There is no doubt these discoveries influence and inspire storytellers. Their very existence serves as cause to dream bigger and open our minds to new possibilities beyond what we think we 'know.'"
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