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Einstein created a relativity theory about gravity that was more accurate than Newton's.
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the thought that the universe was expanding was thought to be impossible.
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Einstein had already introduced his theory of relativity, and produceda model of space based on the theory that space was curved by gravity
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Alexander Friedmann used field equations to figure out that the universe was expanding
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Lemaître wrote an article suggesting the Big Bang Theory but he did not have the data to back it up. He used Einstein's theory of relativity.
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an oversation was taken and it was noted that all distant galaxies and clusters hav a velosity that is directed away from our vantige point
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hubbles law, stated that galaxy are moving away from each other at an ever increasing rate
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hubble was able to calculate the distance of an object in the universe by the velocity oft the object
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hubble anounced that galaxies out side of the milky way were moving away from us at the distace they are from us
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hubble made his measrements and compared them to the red shift and it made a famous hubble digram