This artist's rendering shows two Saturn-size planets discovered by NASA's Kepler telescope. Scientists say there is evidence of a third planet, a much smaller one, whose diameter appears to be about 50 percent larger than Earth's. NASA hide caption

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NASA

Astronomers Identify Two New Solar Systems

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Images Show A Shrinking Moon

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Astronauts To Conduct Third Spacewalk To Fix Pump

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SETI Throws A Party

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Astronauts will spacewalk on Wednesday in an attempt to fix a broken cooling pump aboard the International Space Station. Though a second pump is currently working, NASA officials are worried about the possibility of it shutting down before the broken pump is fixed. NASA hide caption

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NASA

NASA Schedules Spacewalk To Fix Broken Pump

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'Packing For Mars' And The Weightless Life

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The satellite arrives as a box of little pieces you can configure any way you wish. Alex Antunes hide caption

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Alex Antunes

DIY Satellites Let You Find Your Own Space

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Biggest Star Still Managed To Hide Until Just Now

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One More Ride On The Space Shuttle (Simulator)

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Sound Asleep: NASA's Mars rover Spirit, seen here in an artist's rendering, has been hibernating through the the cold and dark Martian winter, and mission scientists aren't sure when its solar panels will have charged the batteries enough for it to wake up. NASA hide caption

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NASA

NASA Waits For Spirit To Send Signal From Mars

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Ring It In: A trip toward Saturn is just one of many space missions scientists might choose to pursue in the coming years. Some researchers want to send a nuclear-powered boat to the methane lakes on one of Saturn's moons, Titan. Cassini Imaging Team/JPL/NASA hide caption

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Cassini Imaging Team/JPL/NASA

What's Next For The Final Frontier?

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More Evidence Of A Wet Past On Mars

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