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The special thing about water on Earth is that it's liquid and has been for a very long time.
by roywiggins 9y ago
The special thing about water on Earth is that it's liquid and has been for a very long time.
- posterboy 9y agoand on the surface
- Symmetry 9y agoThat might not be that important? It was most of a billion years between when life arose on Earth and when life figured out photosynthesis so you can get a long way with just chemosynthesis.
- John_KZ 9y agoSunlight, gas exchange, weather and lighting might be very important, but it's hard to know. There are many theories regarding which types of abiogenesis are possible so the required circumstances are unknown.
- AlanSE 9y agoJust wait until detailed data on Earth-sized exoplanets comes in. That might not be very special at all. We just don't know yet.