To make the pictures from New Horizons usable, Lauer and his colleagues had to rework the mission’s data processing procedure to eliminate the parts of the images that were overexposed by sunlight and therefore didn’t contain any useful data. “It’s like driving in a car with a dirty window, looking into the sun without a sun visor, trying to read a street sign.” “When you look back at Pluto’s dark side, you turn around and look almost right at the sun, and it’s pretty damn bright,” says Tod Lauer at the US National Optical Infrared Astronomy Research Laboratory in Arizona, who is part of the New Horizons team. Taking images of Pluto from beyond its orbit is difficult because at that position, it is backlit by the sun. On its way past Pluto in 2015, NASA’s New Horizons spacecraft turned around and took pictures of this world’s back, and after a lengthy cleaning-up process, the images have revealed some of the first details we have ever seen of the side that wasn’t illuminated by the sun at the time. Moonlight on Pluto has revealed some of the dwarf planet’s dark side. NASA/Johns Hopkins APL/Southwest Research Institute/NOIRLab The dark side of Pluto is faintly illuminated by sunlight reflected by the moon Charon in images captured by the New Horizons spacecraft in 2015

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