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PBS Space Time
What If the Galactic Habitable Zone Limits Intelligent Life?
Season 8
Episode 15
Our solar system is a tiny bubble of habitability suspended in a vast universe that mostly wants to kill us. In fact, a good fraction of our own galaxy turns out to be utterly uninhabitable, even for sun—like stellar systems. Is this why .. most of us .. haven’t seen aliens?
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18:32
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15:35
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Is there a limit to how much energy you can cram into, or pull out of one patch of space?