Oct. 5th, 1923: Hubble discovers galaxies beyond the Milky Way

On Oct. 4, 1923, Edwin Hubble took a photographic plate of the Andromeda Nebula (as it was known then) using the 100-inch Hooker telescope at Mount Wilson. The next night, Oct. 5th, he took another plate and found that a star that seemed to belong to the nebula had changed in brightness. At first, he thought thisContinue reading “Oct. 5th, 1923: Hubble discovers galaxies beyond the Milky Way”
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