There may be Earth-size satellites orbiting exoplanets that can be detected using Kepler data. But where the HEK are they?
The array could be the most complex and versatile radio telescope ever attempted, with the capacity to sweep the entire northern sky in 45 days for low-frequency radio waves
A lunar sample collected by Apollo astronauts suggests that other-Earthly geophysics drove the moon's churning interior
During the cold war the U.S. found ways to work with the Soviet Union on space missions
The ambitious Laser Interferometer Space Antenna, a casualty of tightening budgets, could rise again
A sun-watching spacecraft has for the first time tracked a comet's path all the way into the solar atmosphere
An experiment going up outside of Chicago will attempt to measure the intimate connections among information, matter and spacetime. If it works, it could rewrite the rules for 21st-century physics
A hand-painted sundial will help Curiosity focus its cameras
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