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Originally Posted by Kizzi
I know some elements are radioactive, but I was wondering that in the distant, distant future, long, long after the stars have gone, will all matter eventually decay into nothing so that finally there will be nothing left in the universe (providing future scientists don't interfere)?
Or will there always be stable atoms left in the universe, because they can't decay any further (as long as the black holes don't swallow them)?
Kizzi 
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I imagine that what will happen is that matter will undergo various state changes untill it settles down into its ground state (lowest energy form). I think it would be a lump of some form of iron (I think iron has the lowest binding per nucleon? I may be wrong).
-Will