Tuesday, November 29, 2011

Known Asteroids

Today a large number of asteroids are known.Around two thousand of them have well-determined orbits and revolve around the Sun as part of the 'main belt', in the gap between Mars and Jupiter.

They are tiny, only a handful having a diameter of more than a few tens of kilometres, and the combined mass of all the asteroids is thought to be only a fraction of that of the Moon.

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