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Edwin Hubble discovered our universe was expanding from his observations of extragalactic nebula (other galaxies) from the Mt. Wilsom Observatory. His discovery was announced in 1925. What Hubble discovered was that the further a galaxy is from ours, the faster it is receding.

Albert Einstein would have received credit for the discovery of the expansion of the universe had he not tinkered with his equations for General Relativity to fudge a "static" universe.

This expansion is the expansion of intergalactic space itself. Our local space is not expanding. In fact, Andromeda, our sister galaxy, is actually approaching us. But the furthest galaxies we can see are moving away at a pretty good clip.

If you would like more information on this, you might look up the "balloon" analogy.

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Aleen Paucek

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Q: What is the universal expansion?
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