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Why do satellites launched into low-Earth orbits not remain there indefinitely?- this is an unsolved problem, but a NASA committee has been assigned to work on it- they tend to collide with other spacecraft and spacecraft fragments- they do not have enough speed to fall freely around the Earth- they run out of fuel, and without fuel, all satellites, no matter what their orbit is, must fall- they lose speed due to friction with the upper layers of the Earth's atmosphere
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