From what I've read, the nights are sooo very COLD that the electronics must be kept warm or else they won't survive. So if the Rovers cease to recieve enough solar energy to power their electronics heaters, they will Freeze over. Appearently, it can get cold enough that contraction of the different metals at solder points will crack and lose connection. There also has to be enough power to keep the basic operating system running or what would tell it to wake up?
Others more knowledgable folks can provide more specific information or correct any of my mistakes
