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Potlemy proposes that the Earth is the Center of the Galaxy and that the Sun, moon, and the rest of the planets orbit around Earth in a geocentric Universe.
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A heliocetric system is introduced by scientist Copernicus
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Glorando Bruno, an Italian scientist, believes that niether the Sun nor Earth are the center of the Galaxy, and he claims that they are just thing one and thing two in countless other planets and stars.
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Tycho Brahe creates a complicated model that uses properties from both the Copernican and heliocetric models where the Sun orbits the Earth and the other planets orbit the Sun
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The planets orbit around the Sun in elliptical paths, Planets travel at their fastest speeds when they are closest to the sun during their orbit, Planets that are closer to the Sun in location have shorter orbidal periods.
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Galileo constructs the first telescopethat allows him to confirm the heliocentric model.
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A book writen by Isaac Newton that explains the three laws of Planetary motion.
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Friedrich Bessel becomes the first scientist to measure steller parallax.
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Henrietta Swan Leavitt discovered a tool to measure Galaxies
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Albert Einsteincreates a model of Gravity.
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Georges Lemaitre creates the first version of the Big-Bang Theory.
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Edwin Hubble learns that how fast galaxies are moving away from Earth is proportional to the distence between them and Earth.
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Fritz Zwicky learns that space between galaxies is filled with matter known as Dark Matter.
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This explains how the distibution of the elements happened, the foundations for the Big-Bang Theory.
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Fred Hoyle belives and claims that the Universe has never changed.
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Cosmic microwave background radiation is found everywhere which helps support the Big-Bang Theory.
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stars on the outskirts of spiral galaxies move faster then was thought which indicates that dark matter has a gravitational pull.
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This Satellite proves that the cosmic microwave background is heat left over from an early Universe.
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Dark energy is pushing the Universe outward at a constant rate
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This device measures the temp. differences in the afterglow of the BIg-Bang. This shows that matter was not evenly distributed in the Universe.
