I've just been thinking lately about reasons to explore space, and mars in particular, and what could be the most immediate applications of doing so. Putting nuclear power plants on Mars was something I was thinking about. We don't want the hazards of these things on Earth, but we are looking for alternative fuel sources. So why not put these things on another planet, refine it to a safer product, and bring it back here. I'm sure it's been thought of before but I am wondering, among all the reasons for exploring space, does this have significant weight in the matter? Is there research done in nuclear engineering - in space? Or are these ideas so far away that it doesn't have a place anywhere but in talking.