ABSTRACT
Asatellite is an object in space thatorbits another body, such as aplanet. The Moon is a natural satellite of Earth. An artificial satellite is a small spacecraft sent into orbit from Earth.
Artificial satellites are used for communication, weather forecasting, navigation, military surveillance, and scientific research. A satellite remains in orbit because of the gravitational pull of the larger body around which it travels. Any spacecraft orbiting Earth is technically a satellite, although manned spacecraft are not usually referred to as satellites. The International Space Station is the biggest artificial satellite. The Hubble
Space Telescope also is a satellite. There are about 2,500 satellites orbiting Earth, and others have been placed in orbit around the Moon, Venus, and Mars.
