-
Telescope
Hans Lippershey, invents the telescope -
Kepler
Kepler's First and Second Laws of Planetary Motion -
Newton's Telescope
The first reflecting telescope was built by Newton. -
Theory of Relativity
Albert Einstein introduces his general Theory of Relativity. -
Sputnik
Sputnik, first object to orbit the Earth, was launched by the Russians. -
Challenger Disaster
Space Shuttle Challenger disaster -
Galileo
Galileo space probe reaches Jupiter. -
Cassini
Cassini begins its journey to Saturn. -
Hubble
Scientists discover the real Hubble Constant -
Near
The Near spacecraft reaches asteroid Eros.