Despite the hostile environment of the lunar surface, scientists cannot fully discount the possibility that living organisms exist on the moon. To guard against the possibility that potentially dangerous bugs will hitch a ride back to earth, NASA long ago devised a costly system to quarantine astronauts returning from the moon until it could be determined that they were not harboring alien diseases. Now, to the concern of some scientists, NASA has lowered its guard against a possible invasion by lunar organisms.
The original plans called for Apollo 11 astronauts to remain sealed inside their spacecraft until it was lifted to the...
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