New photos of Mercury's mysterious north pole reveal a glimpse of the permanently dark, frigid craters that may hold ice dozens of feet thick, even though Mercury is the closest planet to the sun.

CAPE CANAVERAL, Fla. (AP) - A spacecraft has beamed back some of the best close-up photos yet of Mercury's north pole. The European and Japanese robotic explorer swooped as close as 183 miles (295 ...

The planet's magnetic North Pole, where compasses point, has been unexpectedly moving toward Russia. While shifting is not a rare occurrence, the pole is moving both faster and differently than it ...