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In page Panspermia:

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The main criticism of radiopanspermia came from Iosif Shklovsky and Carl Sagan, who cited evidence for the lethal action of space radiation (UV and X-rays) in the cosmos.[1] If enough of these microorganisms are ejected into space, some may rain down on a planet in a new star system after 106 years wandering interstellar space.[citation needed] There would be enormous death rates of the organisms due to radiation and the generally hostile conditions of space, but nonetheless this theory is considered potentially viable by some.[citation needed]