If you don't know much about this little spacecraft, check out its website. Designed with a completely passive cooling system, it will stay at 600C on the sun side, but room temperature behind the sunshade. During its 6 year journey it used its solar panels as sails, using the solar wind instead of thrusters to adjust its trajectory. Over then next year it will build a high-rez map of Mercury, and maybe determine if there is really ice hiding in polar craters on Mercury."
Link to Original Source