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When is an asteroid not an asteroid?

( -- On March 29, 1807, German astronomer Heinrich Wilhelm Olbers spotted Vesta as a pinprick of light in the sky. Two hundred and four years later, as NASA's Dawn spacecraft prepares to begin orbiting this intriguing ...

dateMar 30, 2011 in Space Exploration
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An Avalanche of Asteroids

Imagine you're a Brontosaurus with your face in a prehistoric tree top, munching on fresh leaves. Your relatives have ruled planet Earth for more than 150 million years. Huge and strong, you feel invincible.

dateMar 29, 2010 in Space Exploration
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