Now, the American space agency has released a never-before-seen animation to celebrate the two-year anniversary of the flyby.
This new, detailed global mosaic color map of Pluto is based on a series of three color filter images obtained by the Ralph/Multispectral Visual Imaging Camera aboard New Horizons during the NASA spacecraft's close flyby of Pluto in July 2015.
NASA scientists created flyover movies that "offer spectacular new perspectives of the many unusual features that were discovered and which have reshaped our views of the Pluto system - from a vantage point even closer than the spacecraft itself", NASA said.
Pluto's terrain is icy and mountainous. It then passes over numerous other locations, showcasing the various mountain ranges, basins, and fractured landscape of Pluto's surface.
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It next continues north over Voyager Terra, a region of rugged highlands, then dips south over an area known as Pioneer Terra that is dotted with deep, wide pits, before ending over the bladed or snakeskin terrain of Tartarus Dorsa in the east.
The second flyover video shows Pluto's largest moon Charon. All the names of Pluto and Charon are informal and pull from science fiction and fantasy sources like "Star Trek" and "Lord of the Rings".
"The complexity of the Pluto system-from its geology to its satellite system to its atmosphere-has been beyond our wildest imagination", said mission Principal Investigator Alan Stern of the Southwest Research Institute (SwRI). "These new maps. will help unravel these mysteries".
The two-minute video combines New Horizons data with digital models of Pluto's elevations and turns them into a visual experience that makes you feel like you're zipping along with the intrepid spacecraft.
The new maps have revealed their complex terrain.