Satellite

Satellites are small object in the air that goes around a larger object.
Satellites including the maid of the planet, when the planet evolves around the sun.
Satellite is divided into two, namely (1) Natural satellites and (2) artificial satellites.

(1) Natural satellites, is formed naturally room space, orbit around the planet.
examples: the Moon, which is a satellite of the earth. besides circling the earth, the moon with the earth is also round the sun. most of the planet has a satellite. Only the planet Mercury and Venus, which has no satellite.

(2) artificial satellite, built by humans and placed in orbit (planet orbit) for certain purposes, including to:
-Communication.
Changes in the weather-observation
-Space investigation
Navigation-aid
-Room laboratory space, and the needs of others.
Artificial satellite launched by rocket or space shuttle.

The first artificial satellite launched by the Soviet scientist, on 4 October 1957, ie, a Sputnik. These satellites carry radio transmitters to send signals to earth