270 B.C.	Aristarchos says Earth is the center of the universe.
1543	Copernicus revives the idea that the Sun is the center of the universe.
1609	Galileo uses a telescope for astronomy
1668	Newton builds the first reflector telescope.
1705	Halley discovers that comets orbit the sun.
1877	Schiapparelli sees "canals" on Mars.
1988	Stephen Hawking writes about black holes
1915	Albert Einstien proves that space itself is curved.
1946	Hubble helps build Hale, the biggest reflector telescope yet made.
1957	Von Braun's team builds 4 stage Jupiter rocket.
1958	NASA is established
1961	Gagarin becomes the first man in space.
1969	Armstrong and Aldren become the first men on the Moon.
1995	Alan Hale and Thomas Bopp discover a comet at the same time.