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Fans of extraterrestrial life may have been disappointed when internet-fed rumors of Martian life ended in a NASA press conference on soil composition. But they can take solace in a newly popular theory that suggests the rest of space may teem with microbes. This once-controversial notion holds that the universe is filled with the ingredients of microbial life, and that earthly life first came from the skies as comet dust or meteorites salted with hardy bacteria. "Studies have shown that microbes can survive the shock levels of being launched into space," said Charles Cockell, a microbiologist at the Open University. "And as more and more organisms are discovered under extreme conditions, it's become more plausible that things could survive in space for the time it takes to go from one planet to another."