Los Alamos National Laboratory gives the Mars rovers a warm feeling all over. That feeling isn’t love – not exactly. It’s plutonium heat. “Without our devices the Mars rovers would have to use battery power to keep their electronics warm,” said Jeff Huling, a Los Alamos scientist. “That would cut down on the lifespan of the mission. Our heaters have extended the lifetime of each rover from 20 days to 90 days or more.”