NASA's New Horizons spacecraft is currently conducting an in-depth 5-month study of Pluto and its moons, a study that includes the first ever flyby of the dwarf planet. New data is transmitted every day, including stunning images and surprising discoveries about Pluto's surface. 

What have we learned from New Horizons?

Some of the most exciting data reveals that Pluto is not a lifeless rock, but instead has an active, changing surface. In the "heart" of Pluto, the terrain is younger than the Appalachian mountains. This information fascinates and puzzles scientists. Pluto ought to be too cold to be active, yet it continues to go through dramatic geological changes. It's possible Pluto is storing heat or has some unknown heat source. Clearly, there is much more to be learned and explored about the dwarf planet in the coming months.

Check out NASA's website for images and more information about the mission.

And find the fascinating story of Pluto's demotion from planet to dwarf planet in one of these books from Hekman Library:

Source: http://space.io9.com/a-guide-to-pluto-everything-weve-learned-from-new-hori-1718799253