Hmm, this is a very old thread. But I came across it when I was googling this issue. I have interest becaue i'm thinking about writting a science fiction story on something that includes this. I asked my physics teacher, and he said it would not decay, but it would become seriosuly dehydrated. I don't agree with Under Dog for the body being perfectly preserved. It won't decompose, but I think the featuers will change, and it may look like a dried up raisin, much like a mummy, because the moisture takes up mass, so the body will kind of deflate. However, if the body was no where near a star or any other source of heat, then yes, I think it will be perfectly preserved because the moisture will freeze, and become solid. But maybe the freezing will cause the body to expand or burst like water frozen in a starphone cup?