Why Does A Satellite Need No Fuel In Order To Go Around A Planet In Its Fixed Orbit?
Answer:
A satellite in orbit around a planet is actually falling while moving forward. But it is moving forward just swiftly enough that its rate of fall matches the curvature of the planet. A satellite is fired into orbit and is pushed tricky by the rocket fuel to reach a very high speed, so it starts next to a lot of energy. As there is particularly little atmosphere at the sort of height that satellites orbit at, there is very little friction to slow it up. So it keep moving at the same speed.
Depending on the strength of gravity of the planet, the satellite will be pulled downwards at a particular rate. So on different planets there will change speeds required to keep a satellite in orbit around it.
But while the amount of atmosphere at the great heights at which satellites orbit is completely low, there will often be a tiny bit of air, and a tiny bit of friction will come to pass. Over a long period of time this can be enough to slow it down a bit and then it slowly starts to spiral closer, meet more air and slows up more. Eventually it burns up due to the friction.
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