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230
Aristarchus
Earth revolves around sun. -
Hans Libbershey
a Dutch spectacles maker invents telescope. -
Galileo
Galleo uses telescopes for astronmical purposes. -
Kepler
Laws of planet motion -
Issac Newton
First reflecting telescope -
Will Huggins
Beginning of analysis of stars -
Copernius
heliocentric theory -
EDWIN HUBBLE
SHOWS GALAXIES EXIST OUTSIDE MILKY WAY. -
Grote Reber
First radio telescope -
Yuri Gagarin
First nman in space. -
Armstrong and Aldrin
Walk on the moon -
Hubble Space Telescope
Telescope put inrto orbit from space shuttle discovery -
Iss
Launched