PBS Space Time

Did Time Start at the Big Bang?

Season 5 Episode 27 | 12m 30s

A hundred years ago we discovered the beginning of the universe. Observations of the retreating galaxies by Edwin Hubble and Vesto Slipher, combined with Einstein’s then-brand-new general theory of relativity, revealed that our universe is expanding.

Aired: 08/11/19

Rating: NR

Video has closed captioning.

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