News tagged with asteroid belt

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When is an asteroid not an asteroid?

(PhysOrg.com) -- 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 ...

Mar 30, 2011
4.8 / 5 (10) 4 | with audio podcast

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. ...

Mar 29, 2010
4.7 / 5 (22) 10 | with audio podcast