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The Big Bang, Cosmology part 1: Crash Course Astronomy #42
Thanks to observations of galaxy redshifts, we can tell that the universe is EXPANDING! Knowing that the universe is expanding and how quickly it's expanding also allows us to run the clock backward 14 billion years to the way the universe began - with a bang. Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com ...
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