Astrobiologists, apparently a relatively new filed of study, have tested a theory and determined that it is possible that microorganisms can jump from planet to planet by using meteorites as hosts. In other words, an asteroid or comet that impacts earth or any other planet could send rock fragments into space that almost serve as spores, possibly spreading life to another planet that can support life. I also saw on the history channel that the same theory, called panspermia or lithopanspermia, can account for the sudden emergence of harmful microorganisms, particularly a epidemic during WWI that killed millions.
http://www.spaceref.com/news/viewpr.html?pid=24844
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