Panspermia

DNA could of came riding along a comet coming from somewhere in the cosmos. DNA would not survive the ride because it would be subjected to intense radiation, but if DNA was riding safely inside the Comet then it could survive. Nasa’s astrobiologist Louis allamandola discovered RNA which is very similar to DNA spontaneously forms in interstellar space. Which could mean that a comet or meteor could pick up RNA and bring it to a planet.

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