Artificial Satellite

Artificial satellite is an object constructed by humans and placed in orbit around the earth or other celestial body. The satellite is lifted from the earth's surface by a rocket and, once placed in orbit, maintains its motion without further rocket propulsion. The first artificial satellite, Sputnik I, was launched on Oct. 4, 1957, by the USSR. Aryabhata was India's first satellite.



An astronaut or cosmonaut is a person trained by a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft. Rakesh Sharma was the first Indian to travel in space.


Revolution of Moon

The revolution of the moon around earth completes in about 28 days. It is same as the time period of rotation of moon about its own axis.


Artificial Satellites

Artificial satellites are man-made bodies that revolve around the earth. They are used for multiple purposes like communication, weather forecasting, remote sensing, etc. Examples: INSAT, IRS, SPUTNIK-I.