"To have any chance of life – at least life like our own – a free-floating Earth would need liquid water. And to have liquid water, a planet needs to keep warm.

"To have any chance of life – at least life like our own – a free-floating Earth would need liquid water. And to have liquid water, a planet needs to keep warm." Maybe, maybe not. http://en.wikipedia.org/wiki/Hypothetical_types_of_biochemistry#Non-water_solvents http://en.wikipedia.org/wiki/Hypothetical_types_of_biochemis...