it has something to do with gravitation i think..they have to re-enter the atmosphere at a speed that will let the get around the gravitational pull so they can re-enter the earth's orbit without crashing into us..
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my son is in the back yard trying to see it.. as it's now landing in the desert. Nothing like Live Science Lessons
Last edited by docholly; 2005-08-09 at 08:07 AM..
Reason: i have my eyes on the telescope.
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