Quote:
Originally Posted by Coldcreation
Hubble discovered a variable star (as I recall) in a distant 'nebula' but the supernova discovery years earlier in the Andromeda nebula, 1880's was already evidence enough.
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Here is a
paper discussing early distance measurements to galaxies. It seems that Hubble wasn't the first one to do that, but Hubble's result was accepted because he used Cepheid variables which according to the linked article was then only accepted distance determination method.
Here is
Hubble's own paper about it.