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doit_the_clown doit_the_clown
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7 years ago
The method used by Hubble to determine the distance to the Andromeda Galaxy (M31), thereby establishing the concept of separate and individual galaxies throughout the universe, was the
A)   observation of Cepheid variable stars.
B)   measurement of the redshift of the whole galaxy.
C)   measurement of stellar parallax, or apparent motion, of stars because of the Earth's orbital motion.
D)   observation of the brightnesses of novas.
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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papachulopapachulo
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7 years ago
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doit_the_clown Author
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7 years ago
Thank you, thank you, thank you!
lipop
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Yesterday
Thanks for your help!!
jasonbourne
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2 hours ago
Helped a lot
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