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Does a human body decompose in a completely sterile environment ? If yes, what decomposes it ? And how fast ? What happens in vacuum ? Can it remain exactly the same ?

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In vacuum for example? –  terdon Nov 10 '13 at 15:25
    
In vacuum, exactly. –  meeyu Nov 10 '13 at 15:37
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Does a human body decompose in a completely sterile environment ?

No it wont. Unstable molecules like ATP will quickly degrade spontaneously. The stable ones like many proteins and lipids wont degrade spontaneously. Enzymes are essential to degrade them and are to be supplied extraneously.

What happens in vacuum ?

Body will dry up :P

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