It's funny that this is coming up now - just this week, there was a pre-print on arxiv.org that explored the possibility of a planet being heated (possibly enou

It's funny that this is coming up now - just this week, there was a pre-print on arxiv.org that explored the possibility of a planet being heated (possibly enough to become habitable) by dark matter annihilation in its core: http://arxiv.org/abs/1103.5086 http://arxiv.org/abs/1103.5086