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PBS Space Time
The Edge of an Infinite Universe
Season 5
Episode 17
Have you ever asked “what is beyond the edge of the universe?” And have you ever been told that an infinite universe that has no edge? You were told wrong. In a sense. We can define a boundary to an infinite universe, at least mathematically. And it turns out that boundary may be as real or even more real than the universe it contains.
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14:28
Is our 3-D universe is just the inward projection of an infinitely distant boundary?
14:12
What if aliens are deliberately keeping quiet for fear that they might be destroyed?
15:13
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14:44
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14:33
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16:30
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14:29
Could cosmic voids be driving the universe?
17:53
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19:19
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19:03
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18:32
The holy grail of physics is a quantum theory of gravity. What if it’s not possible?