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Science Mission Directorate
NASA uses orbiting observers and robotic landers to investigate the planets, moons, comets, and asteroids of our Solar System.
Latest Features
Readying for Mars: Live 'Clean Room Cam' and Chat
Q&A: A Green Comet
We hear a lot about "going green" these days. The latest to join in the trend is comet Lulin, which is making an appearance in the nighttime sky this month.
Dawn Images The Red Planet
NASA's Dawn spacecraft imaged Mars during a Tues., Feb. 17 flyby. The flyby effectively changed the spacecraft's velocity as it heads toward future encounters with Ceres and Vesta.
More Features
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Award to Recognize Phoenix Mars Lander Team
The team that developed and operated NASA's Phoenix Mars Lander mission will receive the 2009 John L. "Jack" Swigert Award for Space Exploration from the Space Foundation.
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Dawn to Rise From Red Planet Today
NASA's Dawn spacecraft will get a boost from Mars gravity today. The spacecraft will streak about 549 kilometers (341 miles) above the planet at 4:28 p.m. PST.
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NASA and ESA Prioritize Outer Planet Missions
At a meeting in Washington last week, National Aeronautics and Space Administration and European Space Agency officials decided to continue pursuing studies of a mission to Jupiter and its four largest moons, and to plan for another potential mission to visit Saturn's largest moon Titan and Enceladus.
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NASA Spacecraft Falling For Mars
The gravity of Mars will change the Dawn spacecraft's path about the sun, helping send the probe toward its 2011 encounter with the asteroid Vesta.
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Spirit Gets Energy Boost from Cleaner Solar Panels
A small but important uptick in electrical output from the solar panels on Spirit this month indicates a beneficial Martian wind has blown away some of the dust that has accumulated on the panels.
News Releases
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NASA Announces 2009 Astronomy and Astrophysics Fellows
02.25.09 - NASA has selected fellows in three areas of astronomy and astrophysics for its Einstein, Hubble, and Sagan Fellowships.
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NASA's Kepler Mission to Seek Other Earths
02.19.09 - NASA's Kepler spacecraft is ready to be moved to the launch pad today and will soon begin a journey to search for worlds that could potentially host life.
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NASA's Swift, Fermi Probe Fireworks From a Flaring Gamma-Ray Star
02.10.09 - Astronomers using NASA's Swift satellite and Fermi Gamma-ray Space Telescope are seeing frequent blasts from a stellar remnant 30,000 light-years away.
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NASA's Great Observatories Celebrate International Year of Astronomy
02.10.09 - Galileo first turned his telescope to the heavens in 1609, marking the dawn of modern astronomy.
 "artist concept of Europa and Jupiter")
 "artist concept of Titan orbiter")
Podcasts
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NASACast: Solar System
Audio and Video podcasts on NASA missions exploring our solar system.
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NASACast: What's Up?
NASA's monthly guide to watching the night sky.
Media Resources
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Remarks at the Carey School of Business, The Johns Hopkins University
12.18.08 - I am pleased to be invited back to Johns Hopkins, and to the Carey School of Business, to speak with you today on the theme of "improving government processes."
› View PDF (36 Kb PDF)
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NASA Update
01.16.09 - Administrator Griffin addresses employees at NASA Headquarters in Washington.
› View PDF (88Kb PDF)