PBS Space Time

Why the Big Bang Definitely Happened

Season 1 Episode 43 | 8m 54s

We pretty much know for sure that the universe was once extremely small, and extremely hot. And we know that something set it in motion, expanding rapidly and continuing to do-so today. But the actual moment of ‘the Big Bang’ is still a bit of a grey area within physics.

Aired: 07/31/16

Rating: NR

Video has closed captioning.

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