Melvin's digital garden

Cosmic Sociology

Proposed in the The Dark Forest scifi novel by 刘慈欣

Fermi’s Paradox

  • Milk way is 13.61 billion years ago
  • contains about 100 to 400 billion stars
  • 100,000 light-years across, would take 5 million to 50 million years to colonize the galaxy


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