Comets were likely a major agent in bringing both water and organic molecules to the surfaceof the early Earth.
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Q2: Organic molecules can only be made by
Q3: Life emerged on Earth about a billion
Q4: Life is thought to be unlikely in
Q5: NASA has found definite proof for the
Q6: Elliptical galaxies, with older stars, will be
Q7: Some meteorites that survive the plunge to
Q8: We now know that photosynthesis is not
Q9: Each factor in the Drake Equation has
Q10: Earth behaves as an artificial pulsar, with
Q11: As yet, no human probe has completely
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