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Crash Course Astronomy
The Big Bang, Cosmology part 1: Crash Course Astronomy #42
Season 1
Episode 42
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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9:57
Phil takes a look at the explosive history of our cosmic backyard.
9:41
Phil looks at how gravity plays out across the universe.
9:45
Phil takes you through the cause and name of the Moon's phases.
9:28
Take a look at the cyclical phenomena that we can see at work in the universe.
11:16
Take a look at all the incredible things you can see with your naked eye.
12:11
Get to know host Phil Plait and begin with answering a simple question: what is astronomy?