/u/jjk's posts in /r/askscience
Is there something about the nature of sunlight or Archean terrestrial geochemistry that favored the emergence of oxygen-producing photosynthesis?
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how much greater a risk of debilitating genetic disease is there in children produced from in-breeding?
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Insolation at 1AU ~1361 W/m². What range of insolation exists at the distance of the asterioid belt?
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How many burns are required on moderately complex spaceflight missions and how is sufficiently precise control over these burns achieved?
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