130-1640. Ptolemy to Galileo
1688-1796. Newton to nebular theory of the solar system
1846. The planet Neptune is discovered
1905. Einstein's theories of special and general relativity
1929. The expanding universe
1967. White dwarfs, neutron stars, pulsars and black holes
1990. The great attractor and dark matter
2004. Organic material found on extrasolar planets.