May 8 2012
From The Space Library
RELEASE: 12-138 NASA'S SPITZER SEES THE LIGHT OF ALIEN "SUPER EARTH"
WASHINGTON -- NASA's Spitzer Space Telescope has detected light emanating from a "super-Earth" planet beyond our solar system for the first time. While the planet is not habitable, the detection is a historic step toward the eventual search for signs of life on other planets. "Spitzer has amazed us yet again," said Bill Danchi, Spitzer program scientist at NASA Headquarters in Washington. "The spacecraft is pioneering the study of atmospheres of distant planets and paving the way for NASA's upcoming James Webb Space Telescope to apply a similar technique on potentially habitable planets." The planet, called 55 Cancri e, falls into a class of planets termed super Earths, which are more massive than our home world but lighter than giant planets like Neptune. Fifty-five Cancri e is about twice as big and eight times as massive as Earth. The planet orbits a bright star, called 55 Cancri, in a mere 18 hours. Previously, Spitzer and other telescopes were able to study the planet by analyzing how the light from 55 Cancri changed as the planet passed in front of the star. In the new study, Spitzer measured how much infrared light comes from the planet itself. The results reveal the planet is likely dark and its sun-facing side is more than 2,000 Kelvin (3,140 degrees Fahrenheit), hot enough to melt metal. The new information is consistent with a prior theory that 55 Cancri e is a water world: a rocky core surrounded by a layer of water in a "supercritical" state where it is both liquid and gas, and topped by a blanket of steam. "It could be very similar to Neptune, if you pulled Neptune in toward our sun and watched its atmosphere boil away," said Micha?l Gillon of Universit? de Li?ge in Belgium, principal investigator of the research, which appears in the Astrophysical Journal. The lead author is Brice-Olivier Demory of the Massachusetts Institute of Technology in Cambridge. The 55 Cancri system is relatively close to Earth at 41 light-years away. It has five planets, with 55 Cancri e being the closest to the star and tidally locked, so one side always faces the star. Spitzer discovered the sun-facing side is extremely hot, indicating the planet probably does not have a substantial atmosphere to carry the sun's heat to the unlit side. NASA's James Webb Space Telescope, scheduled to launch in 2018, likely will be able to learn even more about the planet's composition. The telescope might be able to use a similar infrared method as Spitzer to search other potentially habitable planets for signs of molecules possibly related to life. "When we conceived of Spitzer more than 40 years ago, exoplanets hadn't even been discovered," said Michael Werner, Spitzer project scientist at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, Calif. "Because Spitzer was built very well, it's been able to adapt to this new field and make historic advances such as this." In 2005, Spitzer became the first telescope to detect light from a planet beyond our solar system. To the surprise of many, the observatory saw the infrared light of a "hot Jupiter," a gaseous planet much larger than the solid 55 Cancri e. Since then, other telescopes, including NASA's Hubble and Kepler space telescopes, have performed similar feats with gas giants using the same method. In this method, a telescope gazes at a star as a planet circles behind it. When the planet disappears from view, the light from the star system dips ever so slightly, but enough that astronomers can determine how much light came from the planet itself. This information reveals the temperature of a planet, and, in some cases, its atmospheric components. Most other current planet-hunting methods obtain indirect measurements of a planet by observing its effects on the star. During Spitzer's ongoing extended mission, steps were taken to enhance its unique ability to see exoplanets, including 55 Cancri e. Those steps, which included changing the cycling of a heater and using an instrument in a new way, led to improvements in how precisely the telescope points at targets. JPL manages the Spitzer Space Telescope mission for NASA's Science Mission Directorate in Washington. Science operations are conducted at the Spitzer Science Center at the California Institute of Technology (Caltech) in Pasadena. Data are archived at the Infrared Science Archive housed at the Infrared Processing and Analysis Center at Caltech. Caltech manages JPL for NASA.
RELEASE: 12-150 NASA COMMERCIAL PARTNER SPACEX COMPLETES CREW ACCOMMODATIONS MILESTONE
CAPE CANAVERAL, Fla. -- Space Exploration Technologies (SpaceX) has finished an important evaluation of a prototype Dragon spacecraft designed to carry people into orbit. This key milestone is part of SpaceX's partnership with NASA under a funded Space Act Agreement to advance the design of crew transportation vehicles. The primary goal of the tests was to determine whether the layout will allow astronauts to maneuver effectively in the vehicle. Several veteran space shuttle astronauts and NASA engineers conducted the evaluation during a pair of two-day-long reviews. "I am very pleased with the progress SpaceX and our other commercial partners are making during the CCDev2 effort," said NASA Commercial Spaceflight Director Philip McAlister. "Together with NASA's development of beyond low-Earth orbit systems, commercial crew and cargo transportation is an integral part of our overall human spaceflight program." As part of the Commercial Crew Development Round 2, or CCDev2, agreement, the company invited the astronauts and engineers to its headquarters in Hawthorne, Calif., to conduct the evaluation. The prototype was equipped with seats, lighting, environmental control and life support systems, conceptual displays and controls, cargo racks and other interior systems. "This milestone demonstrated the layout of the crew cabin supports critical tasks," said SpaceX Commercial Crew Development Manager Garrett Reisman. "It also demonstrated the Dragon interior has been designed to maximize the ability of the seven-member crew to do their job as effectively as possible." During the reviews, space shuttle veterans Rex Walheim, Tony Antonelli, Eric Boe and Tim Kopra participated in so-called "human factor assessments." This included entering and exiting Dragon under normal and emergency scenarios. They also performed reach and visibility evaluations. "As an anchor customer for commercial transportation services, we are happy to provide SpaceX with knowledge and lessons learned from our 50 years of human spaceflight," said Commercial Crew Program Manager Ed Mango. "We appreciate the opportunity SpaceX gave us to provide feedback on these critical interior systems while the company maintains its flexibility to appeal to other customers." This is the seventh of 10 milestones SpaceX must meet under the CCDev2 agreement, which continues through July 31. This includes the development of a launch abort system for crew escape during launch or ascent. All of NASA's industry partners continue to meet their established milestones in developing safe, reliable and affordable commercial crew transportation capabilities.
MEDIA ADVISORY: M12-083 NEXT SOYUZ SPACE STATION CREW PREPARES FOR LAUNCH
HOUSTON -- The next residents of the International Space Station are making final preparations for a May 14 launch and NASA Television will provide live coverage of launch and docking. This week, NASA Flight Engineer Joseph Acaba and his two Russian crewmates, Soyuz Commander Gennady Padalka and Flight Engineer Sergei Revin, are completing their training, undergoing Soyuz spacecraft fit checks and taking part in traditional ceremonies. Video file documentation of the final preparations will be broadcast starting May 10. Live NASA TV coverage of the Soyuz TMA-04M spacecraft launch from the Baikonur Cosmodrome in Kazakhstan begins at 9 p.m. CDT on May 14 (May 15, Baikonur time), with launch scheduled for 10:01 p.m. The trio will arrive at the station May 16, joining Expedition 31 Commander Oleg Kononenko of the Russian Federal Space Agency, Flight Engineer Don Pettit of NASA and Flight Engineer Andre Kuipers of the European Space Agency, who have been aboard since December 2011. Padalka, Acaba and Revin will transition to the Expedition 32 crew in July and return to Earth in mid-September.
