Some scientists believe that all of the water on earth was the result of icy comets bombarding the primordial planet and simply melting into deep oceans, lakes and seas. Others believe that ancient microorganisms hitched a ride and gave rise to life for the first time. It seems to be a preposterous proposition. Unless you consider that a fresh comet is en route with the seeds of a new form of life, or perhaps...a new form of death. 

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