Man’s curiosity for knowledge has led him to explore space. Space contains the planets, countless galaxies and milky ways. Man has been able to go to space and collect pictures of the sun, the planets and the moon. The first man made satellite Sputnik-1 was sent into space by Russia in 1957. Uri Gagarin of Russia became the first man to go into space. Man has landed on the moon and he is trying to find out the existence of life on other planets. Telecommunication, weather forecasting, radio and television programmes etc. are all monitored by satellites in space. There are also military stations and spy satellites in space which pose a threat of a nuclear war. This should be avoided and scientists should work for the benefit of mankind.