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Q&A Planetary Habitability at twelve to seven billion years ago

Following this question, I had additional question of habitability. Assuming that life could exist on planet formed roughly twelve billion years ago, allowing complex life to exist as of seven bill...

4 answers  ·  posted 9y ago by Hendrik Lie‭  ·  last activity 9y ago by Hendrik Lie‭

Question physics origin-of-life habitability survival life