Big Bang Theory, Dark Matter and Dark Energy: 2. What’s the Evidence for the Big Bang and Expansion of the Universe? What Do We Measure and How?

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What’s the evidence? How we know the Big Bang happened, and that the universe is expanding and accelerating. How we measure how fast different parts of the Universe are moving away.

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This was part of the College of Arts & Sciences "What's New in Science" series in 2012.

Click here for the FAQs and answers for the Big Bang, Dark Matter, and Dark Energy.