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Full title:
The Big Bang, Cosmology Part 1 - S1.E42 - Crash Course Astronomy
Episode number:
S1.E42
First aired:
November 26, 2015
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The Big Bang, Cosmology Part 1 - S1.E42

November 26, 2015
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Overview

Thanks to observations of galaxy redshifts, we can tell that the universe is EXPANDING! Knowing that the universe is expanding and how quickly its expanding also allows us to run the clock backwards 14 billion years to the way the universe began - with a bang.

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