JustATheory
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I was reading up on the Andromeda Galaxy and it was saying that it was 2.2 to 3 million light years away from earth. So my question is how do we measure how far it is in light years?
Measuring Light Years: How Far Is the Andromeda Galaxy?
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Read this article: http://en.wikipedia.org/wiki/Cosmic_distance_ladder
JustATheory
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Awesome thank you!
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In fact, Cepheids were used to establish the fact that galaxies other than the Milky Way actually existed in the universe! re: http://hubblesite.org/newscenter/archive/releases/2011/15
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