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Panspermia is the hypothesis that life originated elsewhere in the universe and spread to Earth, and perhaps other places, on objects like asteroids. Astrobiologists, who investigate the possibility of life in space, point out that some microorganisms can, in fact, survive in space but that the long distances between planets would make surviving an interplanetary trip quite difficult, even for extremophiles. What tiny invertebrate was sent into orbit and survived exposure to the vacuum of space? Discuss
Source: The Free Dictionary