Edwin Hubble’s Discovery of the Accelerating Expansion of the Universe

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Edwin Hubble was able to work out not only how far a star or galaxy was from Earth, but also the speed at which it was moving away from Earth, a finding which was profound because in a stable universe, stars and galaxies should move away or towards something at random values, however Hubble determined that the further away a star or galaxy, the faster it moves away, which proved that the universe is expanding

Edwin Hubble’s Greatest Discovery

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Edwin Hubble was the first person to notice variability within the luminosity of stars. From this, Hubble was able to work out the distance between the Earth and any star in the universe. This permitted Hubble to calculate how far the Andromeda Galaxy was which is the galaxy nearest to Earth. Albert Einstein did not believe the implications of his own equations and thus added lambda, expressed as “Λ”, to his equations. Lamda was designed to act as an antigravity force, an addition Einstein stated was “necessary only for the purposes of making a quasi static distribution of matter” which means to “maintain the status quo” or to “keep things as they always were”. Once lambda was removed from Einstein’s equations, each one fit perfectly with the observable model of the universe as they account for expansion. Einstein refused to believe the universe was constantly undergoing expansion until years after scientists had confirmed it to be true