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Rosetta: To chase a comet

Comets are among the most beautiful and least understood nomads of the night sky. To date, half a dozen of these most heavenly of heavenly bodies have been visited by spacecraft in an attempt to unlock their ...

Jan 20, 2014 4.8 / 5 (4) 0

Retrieving an asteroid

(Phys.org) —Asteroids (or comets) whose orbits bring them close to the earth's orbit are called near Earth objects. Some of them are old, dating from the origins of the solar system about four and one-half ...

Dec 27, 2013 4.9 / 5 (32) 60 | with audio podcast