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What keeps earth in its orbit?
The sun's gravitational pull keeps the earth in orbit around it.
What are spying satellites?
satellites that spy typically in a low earth orbit with a big telescope looking down at the ground, like google satellite on steroids
Explain what keeps the moon orbiting Earth?
Because the moon moves with a certain speed in its orbit, that orbital motion produces a centrifugal force which opposes the attraction of gravity. The balance between gravity and centrifugal force keeps the moon in orbit. The moon continues to orbit at the speed it does, because of its inertia. Moving in the vacuum of space, the moon does not encounter resistance to its motion. There is, however, some energy lost as a result of tidal forces, and that will, over a very long period of time, eventually alter the moon's orbit.
After a shuttle is launched into orbit what happens to gravity?
There is no gravity in space but the shuttle stays in orbit because of the Earths gravity and inertia. The inertia keeps it going in a circular motion. In space the Earth's gravity is strong enough to hold something in orbit but not strong enough to pull it to Earth's surface.
An instrument that makes small distant objects visible?
telescope or maybe binoculars
