Photo: NASA "Clean Rooms" Brimming With Bacteria



A NASA worker samples the floor of a "clean room" for evidence of bacteria.


A recent study shows that these supposedly sterile rooms where spacecraft are assembled may be home to at least a hundred species of bacteria.


If not eliminated, the organisms could interfere with a spacecraft's instruments or contaminate other planets, experts say.


Photograph by Jet Propulsion Laboratory, California Institute of Technology

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