Phoenix Mars Lander Hits Halfway Point
It doesn't come easy writes "There is a nice write-up over at Space.com about Phoenix, NASA's next Mars lander. The article includes a few more details about the steps NASA is taking to ensure a successful mission." The Phoenix project was first given the green light earlier this year and hopes to benefit from some hard lessons learned on earlier projects.
It sublimes, which means that it goes directly from a solid to a gas.
This is more to do with pressure than temperature-it doesn't mean the ice is melting becasue it's 200 kelvin or anything.