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PBS Space Time
What If Space is Not Empty?
Season 9
Episode 23
Spacetime on its smallest scales is a seething ocean of black holes and wormholes flickering into and out of existence—or so many physicists think has to be the case. But why should we take this spacetime foam seriously if we’ve never seen any evidence of it?
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14:12
What if aliens are deliberately keeping quiet for fear that they might be destroyed?
15:13
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14:33
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16:30
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14:29
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19:19
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19:03
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18:32
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18:32
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