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Apr 29, 1543
Copernicus publishes his heliocentric theory of the Universe.
Occured in Poland -
Galileo uses telescope for astronomical purposes.
He discovers 4 Jovian moons, the Moon's craters and the Milky Way galaxy, in Italy. -
The Third Law of Planetary Motion is announced by Kepler in his work Harmonice Mundi (Harmony of the World).
Germany -
The discovery of Uranus by Herschel
England -
Schiaparelli observes the canals on Mars.
Mars -
Huygens notes markings on Mars.
Netherlands -
Space Shuttle Challenger disaster
U.S.A. -
Galileo space probe reaches Jupiter.
Near Jupiter -
Galileo discovers origin of Jupiter's Rings
Jupiter -
New evidence found for water on Mars.
Mars