A satellite is any object that orbits or revolves around a larger object. For example, the Moon is a satellite of Earth, and Earth is a satellite of the Sun.An orbiting satellite is a projectile, the only force acting upon it is the force of gravity. Most Earth satellites are orbiting at a distance high above the Earth such that their motion is uninfluenced by forces of air resistance.
The components of the satellite are:
These components enable the satellite to communicate with one or more ground stations, called command centers. Messages sent to the satellite from a ground station are "uplinked"; messages transmitted from the satellite to Earth are "downlinked."
Many satellites depend on the sun power as they have sun silvery solar panels on its surface, other satellites have fuel cells that convert chemical energy to electrical energy, while there is a few depend on nuclear energy.