Photo: Andromeda nebula plate with Hubble's handwritten circle around the variable star he discovered In 1919 American astronomer Edwin Hubble began work at the Mount Wilson Observatory in ...
On January 29, 1931, the world's premier physicist, Albert Einstein, and its foremost astronomer, Edwin Hubble ... in the telescope's instruments. Like a child at play, he scrambled about the ...
The two keys to Edwin Hubble's breakthrough discovery were forged by others in the 1910s. The first key, the period-luminosity scale discovered by Henrietta Leavitt, allowed astronomers to ...
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