of course satellites have to overcome drag, which mostly come

送交者: steven 于 2007-03-03, 15:14:58:

回答: the wrong thing is 由 xinku 于 2007-03-03, 10:31:44:

from the atmosphere. The drag is not as great as aircraft, but it is enough to slow down satellites and causing them to descend to lower orbits. That is why burn is required from time to time to keep them in orbits.

所有跟贴:

A simple question, - 唐好色 (270 bytes) 2007-03-04, 22:22:22 (128345)
- The exosphere is the outmost atmosphere, which is from - steven (213 bytes) 2007-03-05, 01:14:21 (128365)

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