They stay put for a fair while - their orbit ends up decaying sometimes as has been previously stated elsewhere, because of the action of the moon's gravity, micro-meteorites, solar wind, and other such teeny-tiny forces that can have an effect over time. Hence they send up the Space Shuttle every so often to straighten out the orbits of the more expensive satellites. :-)
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Date: 2003-10-21 07:33 am (UTC)