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Hubble provided evidence that the recessional velocity of a galaxy increases with its distance from the Earth, a property now known as "Hubble's law", despite the fact that it had been both proposed and demonstrated observationally two years earlier by Georges Lemaître. The Hubble–Lemaître law implies that the universe is expanding. A decade before, the American astronomer Vesto Slipher had provided the first evidence that the light from many of these nebulae was strongly red-shifted, indicative of high recession velocities.

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Edwin Hubble Biography, Edwin Hubble Discoveries, Edwin Hubble Quotes, Edwin Hubble Telescope, Edwin Hubble Facts, Edwin Hubble Big Bang Theory, Edwin Hubble Timeline, Edwin Hubble Pictures, 

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