How are spacecraft interiors sterilized to discourage bacterial contamination of moon/planets in case of crash?

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The older method used to be dry heat sterilisation:

http://en.wikipedia.org/wiki/Dry_heat_sterilization

Basically, you bake it in an oven for a few hours. This is apparently sometimes not great for spacecraft, so newer methods are being developed, like zapping your spaceraft with a plasma gun:

http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/40576/1/07-1766.pdf

Interiors (1978) Trailer

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