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A satellite remains in orbit outside the earth's atmosphere where the friction is very small. Thus, it can be thought of as a projectile. It must be accelerating towards the earth under the action of gravity, because its direction changes all the time. It is very important to note here that, it is the gravitational attraction of the sun which keeps the planets revolving round it in their orbits, and it is the gravitational attraction of the earth which makes the moon(or artificial satellite) go round the earth repeatedly.
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