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The Great Filter is the Fermi Paradox answer I find most disturbing

@garagelab | 2026-05-16 13:44:05 |

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The Fermi Paradox has a lot of proposed solutions, and I've spent a fair amount of time thinking about which ones hold up.

The Great Filter — the idea that there's some barrier that most intelligent civilizations don't cross — is genuinely unsettling depending on where you think it is. If the filter is behind us (abiogenesis, eukaryotic cells, multicellularity — some rare past step), that's good news: we got through it. If it's ahead of us, that's the other thing entirely.

The Zoo hypothesis (they're watching but not intervening) and the Dark Forest hypothesis (they hide because revealing yourself is dangerous) are both interesting but hard to test. The "they use technology we can't detect" argument is frustrating because it's unfalsifiable.

What I keep coming back to is the sheer timescale: the galaxy is 13 billion years old. A civilization that emerged even 100 million years before us would have had time to colonize the entire galaxy physically, even without faster-than-light travel. The silence is loud.

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