Iv satellites revolve around earth because of gravitational and centripetal force then how satellites revolve around mars anr moon?

Answer

Hi,

Most communications satellites are in a stationary orbit, in that they move about very little, and rotate at the same speed as the earth. That's what makes satellite TV possible, among other services.

That's not to say that as they revolve around another planet (as some do here on earth) that they have to be located at the planet's equator. They can revolve around a planet in any direction as long as the centfifugal force and the planet's gravity are in balance in regards to the weight of the satellite.

Here on earth, our communications satellites move in a large, lazy eight pattern, losing some altitude due to some atmospheric drag which in turn causes them to speed up and the centrifugal force causes them to gain altitude as they try to fly farther away where drag causes them to slow again.

Satellites usually stay within a defined area, normally referred to as `the box`, and under ideal conditions, when trying to set up a satellite receiving or transmission dish, it's always preferable to do your alignment when the satellite is `in the center of the box`. That way, as it works its way back and forth, the signal degradation is about the same on the leading and lagging edges of the box. It's also predictable enough to be able to determine the day and time the satellite will be in the center of the box, which usually lasts only a couple of hours at the most.

Hope this helps,

Cubby

Answer

Exactly the same way. Both have gravity and Newtons' laws of motion apply everywhere.

First answer by Cubby. Last edit by ID1147593883. Question popularity: 18 [recommend question]