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Albert Einstein introduced the cosmological constant.
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It is known in this year that galaxies are in fact flying apart.
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Edwin Hubble discovered that faraway galaxies all seem to be flying away from Earth
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Some from of invisible dark matter is thought to be holding things together in the universe, keeping them from flying away from eachother.
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Fritz Zwicky noted that the orbits of distant galaxies were impossible without gravity or some sort of dark matter.
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Two Astronomers, Arno Penzias and Robert Wilson provided a confirmation of the Big Bang Theory. ((ACCIDENTAL DISCOVERY))
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Brian Schmmidt set out to determine whether the expansion of the universe was slowing down, and by how much.
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Mark Phillips and Ron Gilliland used the Hubble Space telescope to spot a supernova and determined its speed of movement away from earth.
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Saul Perlmutter and Brian Schmidt both achieved weird results when calculating the cosmic expansion. They both came to the conclusion that the universe was not slowing down.
