The Atmosphere of Pluto

One of the most amazing parting shots of the planet Pluto, backlit by our distant Sun. Taken by the New Horizons probe as it rushed away from the planet in 2015. Look closely and Plutonian mountains can be seen casting long shadows through the hazy blue atmosphere.

As of now Pluto is the only trans-Neptunian object with a known atmosphere.

Image credit @nasa

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