Ask Ethan: How can ultra-distant galaxies move so fast?
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When it comes to the distant galaxies in the Universe, one of the most profound discoveries in all of history is also one of the most puzzling: the fact that they’re almost all mutually receding from one another. It was only in 1923 that we firmly established that extragalactic objects — objects beyond our own Milky Way — even existed, with Hubble’s detailed measurements of Andromeda placing its distance far beyond the Milky Way itself. Just a few years later, from 1927-1929, enough evidence had
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