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280 BCE
Greek astronomer Aristarchus suggested that Earth rotates around the Sun
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240 BCE
Greek astronomer Eratosthenes accurately measured Earth's circumference.
Bald ugly dude. -
130 BCE
Greek astronomer Hipparchus developed the first accurate star map
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Period: Feb 19, 1473 to May 24, 1543
Copernicus Lifespan
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1543
Copernicus, a Polish astronomer, developed the Heliocentric Theory.
Ugly dude. -
Period: Feb 15, 1564 to
Galileo Galilei Lifespan
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Period: Dec 27, 1571 to
Johannes Kepler Lifespan
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Dutch man Hans Lippershey invented the Telescope.
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Italian astronomer Galileo Galilei used the Telescope to discover Jupiter's moons and more.
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German astronomer Johannes Kepler developed his First and Second laws of motion
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Johannes Kepler developed his Third law of motion.
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Danish astronomer Ole Romer measured the Speed of Light
Ugly dude. -
William Herschel, a German-British Astronomer, discovered Uranus.
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Piazzi, Italian astronomer and priest, observed the first known asteroid, named Ceres.
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German Astronomer Johann Galle discovered Neptune using a telescope and math
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German physicist Albert Einstein introduces the Theory of Relativity
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American Astronomer Edwin Hubble First Observed a Galaxy Outside of the Milky Way
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Cosmic Microwave Background Radiation is discovered by Penzias and Wilson
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USA wins the Space Race by putting the first man on the moon
Debatable. -
Saul Perlmutter Discovers that the Universe is expanding at a constantly increasing rate.
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Scientists finally discovered the real Hubble Constant.
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The First Black Hole is photographed by the Event Horizon Telescope.