Quote:
Originally Posted by m1omg
But if you some take organics and water from meteors, asteroids and comets, as a variant of panspermia; then I will vote panspermia, but only precursors for life were transported to Earth - the rest was done here.
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Technically, since Earth was formed by planetoids which clumped into planetesimals and then into planets, all water and organic chemicals on Earth did start out in comets and asteroids.
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