-
140 - Greek astronomer Ptolemy develops geocentric theory of the universe
with Earth at the center -
1543 - Polish astronomer Nicolaus Copernicus publishes his heliocentric theory
of the Universe -
1572 - Danish astronomer Tycho Brahe discovers a supernova in constellation of
Cassiopeia -
1609 - Italian astronomer Galileo Galilei uses telescope to discover four moons of
Jupiter, craters of the moon and the Milky Way Galaxy -
1610 - Galileo Galilei discovers Saturn’s rings
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