Summary #692

Study suggests frozen Earthlike planets could support life

blogs.agu.org
  • Discovery of warm temperature zones on ‘snowball’ planets suggests that they might have areas with life on them.
  • They are the second type of planets, next to warm and temperate ones like Earth, which float around in the habitable zones of galaxies.
  • Earth might have gone through up to three snowball phases in the past, too.
  • Planets become snowballs when atmospheric carbon dioxide levels drop too low, but some were found to have areas warm enough for liquid water and life.
  • The border between a habitable and uninhabitable planet might not be as definite as geologists once thought.

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