28.1 Looking Back in Time

Looking Back in Time (1 of 3)

Clusters of galaxies move away from each other as the space between them expands: Duration: 8:46.

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Looking Back in Time (2 of 3)

There is no space outside the universe. All space as we currently understand it, resides within the universe. Duration: 6:20.

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Looking Back in Time (3 of 3)

The CMBR and the abundance of helium in the universe are discussed as evidence supporting Big Bang theory. Duration: 7:51.

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