July 15, 2015: NASA is presenting the first images acquired by the New Horizons probe during its historic flyby of Pluto. Chief scientist Alan Stern said the new images showed evidence of geological activity and mountains in the Pluto system. The team has also named the prominent heart-shaped region on Pluto after the world's discoverer Clyde Tombaugh. The spacecraft sped past the dwarf planet on Tuesday, grabbing a huge volume of data. Image Credit: NASA-JHUAPL-SwRI