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Cosmology in the Early 20th Century
Prior to the 20th Century cosmology was the study of objects in the universe, not the physics of the universe as a whole.
Einstein published General Relativity in 1915 which established a theoretical framework for understanding the universe as a whole.
There was one cosmological fact – The night sky is dark (Olber’s paradox).
Einstein ignored it and introduced the “cosmological constant” to allow a solution for an infinite static universe . Einstein’s biggest blunder?
In 1925 Hubble showed that the Andromeda Nebula and other similar nebulae are separate galaxies, not part of the Milky Way.
In 1929 Hubble and Humason formulated the redshift-distance law for Galaxies -> expanding or Big Bang universe.
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Category : Cosmologycosmic microwave backgroundcosmic microwave background radiationbackground radiationmicrowave background radiation
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