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Keeping Alien Samples Safe For Study
Metrollica writes: "Space.com features an article describing NASA's plans to prepare the Johnson Space Center that could one day house extraterrestrial life." An excerpt from the article: "It's human nature to clean for company more thoroughly than one would for oneself, but nowhere is this truth taken to greater extremes than at the Johnson Space Center. NASA's setting new standards of cleanliness in its labs that handle samples returning from space. And their efforts are laying the groundwork for samples that might some day contain evidence of extraterrestrial life from Mars, Europa, and other points little known."
Evolution is the key here - space fungus would not benefit from same traits than its the earthbound predecessor, if cosmic radiation by change mutated something that would've done well on Earth, it would lose those quite fast to save energy and give way to strains with new charasteristics better fitted into space. Now when that thing crashed down there, it has zero change of taking over the world, because it has specialized into very different environment, it's very ancestors will outcompete it with ease.