The International Space Station. Credit: NASA
Sunday, May 20, 2012
Friday, May 18, 2012
JAXA'S GLOBAL CHANGE OBSERVATION MISSION
FROM: JAXA
Publisher :
Public Affairs Department
Japan Aerospace Exploration Agency (JAXA)
Marunouchi Kitaguchi Building,
1-6-5, Marunouchi, Chiyoda-ku, Tokyo 100-8260 Japan
TEL:+81-3-6266-6400
May 18, 2012 (JST)
Global Change Observation Mission 1st - Water "SHIZUKU" (GCOM-W1)
AMSR2 Antenna Deployment
Japan Aerospace Exploration Agency (JAXA) confirmed that the Global Change
Observation Mission 1st - Water "SHIZUKU" (GCOM-W1) successfully deployed the
antenna of the Advanced Microwave Scanning Radiometer 2 (AMSR2)* via image data
received at the Katsuura Tracking and Communication station.
The satellite is currently in good health.
* : Advanced Microwave Scanning Radiometer2 (AMSR2)
The AMSR2 measures electromagnetic waves called microwaves (six bandwidths
between 7 GHz and 89 GHz) emitted from nature, such as the ground and ocean
surface as well as objects in the atmosphere, to observe eight geophysical
parameters (integrated water vapor, integrated cloud liquid water,
precipitation, sea surface temperature, sea surface wind speed, sea ice
concentration, snow depth, soil moisture content).
Thursday, May 17, 2012
Tuesday, May 15, 2012
Monday, May 14, 2012
Sunday, May 13, 2012
Saturday, May 12, 2012
Friday, May 11, 2012
Thursday, May 10, 2012
LIGHT OF ALIEN SUPER EARTH
FROM: NASA
News Releases
May 8, 2012 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 Michaël Gillon of Université de Liège 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 tele
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.
Wednesday, May 9, 2012
Tuesday, May 8, 2012
Subscribe to:
Posts (Atom)