by Ciro Santilli (@cirosantilli, 37)
No life, earth too hot, until formation of water.

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  1. Eon
  2. Geologic time scale hierarchy
  3. Geologic time scale
  4. Earth science
  5. Earth
  6. Planet in the Solar System
  7. Solar System
  8. Orion Arm
  9. Arm of the Milky Way
  10. Milky Way
  11. Local group
  12. Virgo Supercluster
  13. Universe
  14. Astronomy
  15. Natural science
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  17. Home

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