| Are
Asteroids Primitive? |
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| | Ida
(56 km diam.) and its moon Dactyl (1.5 km diam.) |
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| | Colors
have been stretched to show subtle differences |
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| | Imaged
by Galileo on its way out to Jupiter |
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| | Presence of craters indicates great age |
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| | Absolute age requires knowledge of cratering rate
uncertain |
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| | Not spherical gravity too weak to pull it into
a sphere |
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