New Horizons' historic flyby of Pluto has produced close-up images revealing never-seen-before details of the dwarf planet's surface. In an image (above) of a region near the equator, a range of icy mountains are seen, some reaching as high as 11,000 ft. The mountains are considered relatively youthful, having formed no more than 100 million years ago, and they may still be in the process of building. More here.