Bits of Ancient Earth Hidden on the Moon
Material from Earth's first billion years may remain in moon meteorites.
Liver Drug May Help Exhausted Spacewalkers
European Cargo Ship Gets Longer Stay at Space Station
Scientists Hunt for Astrobiology at Carl Sagan Center
Huge Impact Created Mars' Split Personality
Study: Mars Had Drizzle and Dew
Phoenix Lander Prepares to Taste Martian Dirt
China's First Spacewalk: A Prelude of Things to Come
Astronomers on Verge of Finding Earth's Twin
VIDEO: Ocean Watch With Jason 2
Image of the Day: Head On (Makes You Want to Blow the Stars from the Sky)
VIDEO: Digging on Mars
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NEW VIDEO: X-Ray-Emitting Black Holes
X-ray observatories help astronomers measure black holes. Credit: ESA