Astronomy By Sierra94 Feb 1, 1234 Aristarchus suggests that the earth revolves around the sun 310-230 b.c. Feb 28, 1543 Copernicus publishes his heliocentric theory Sep 25, 1608 Hans Lippershey invents the telescope Feb 28, 1609 Kepler comes up with his laws of planetary motion Jan 7, 1610 Galileo uses telescope for astronomical purposes. He discover 4 of Jupiter's moons, the Moon's craters and the Milky Way galaxy. Feb 28, 1668 Isaac Newton built the first refelcting telescope Aug 29, 1864 The beginning of spectral analysis of stars Feb 28, 1919 Edwin Hubble shows that galaxies exist outside the Milky Way Feb 28, 1937 First radio telescope built by Grote Reber Apr 12, 1961 Yuri Gagarin becomes the first man in space. Jul 20, 1969 Aldrin and Armstrong, Apollo 11 mission Apr 24, 1990 Hubble Space Telescope put into orbit from space shuttle Discovery. Feb 28, 1998 ISS launch
