Astronomy Cast Ep. 123: Homogeneity

http://www.astronomycast.com/archive/

From January 9, 2009.

As astronomers discovered that we live in a great big universe, they considered a fundamental question: is the Universe the same everywhere? Imagine if gravity was stronger billions of light years away… Or in the past. It sounds like a simple question, but the answer has been tricky to unravel.

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