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Rare Earth? PowerPoint Presentation
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Rare Earth?

Rare Earth?

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Rare Earth?

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  1. Rare Earth? 6 Dec 2018

  2. Life so far • Microbial life may be widespread in the universe • Life arose quickly on Earth • Our dirty environment was suitable • Planets are common • Water-Energy-Biogenic elements are widely available • Life fills all plausible Earth environments

  3. Earth is a pale blue dot • https://www.youtube.com/watch?v=GO5FwsblpT8 • Ward & Brownlee: Don’t marginalize Earth • Earths with complex life are rare • It is still possible that life is rare, even unique • Sagan: Better protect life here on Earth