Blue Skies of Pluto

On July 14, 2015 NASA’s New Horizons probe captured Pluto’s night-side illuminated by sunlight. Ponder blue skies of Pluto – not so different from planet Earth.

Blue sky phenomenon stems from small atmospheric particles scattering sunlight. Earthly particles are nitrogen molecules, on Pluto sootish little particles called tholins do the job. From –

“The term “tholin” was coined by Carl Sagan and Bishun Khare to describe organic substances they obtained in Miller-Urey experiments on gas mixtures akin to atmosphere of Saturn’s moon Titan. On Pluto, tholins form high in the atmosphere where UV sunlight breaks apart nitrogen and methane molecules. The fragments re-combine to form complex macromolecules. These macromolecules continue to combine and grow until they become “tholins.”

Nightside of Earth –

Tholins themselves aren’t blue, rather gray or red particles scattering sunlight. Science believes some of Pluto’s splotchy red surface comes from Tholin particles falling from the atmosphere.


3 thoughts on “Blue Skies of Pluto

  1. Well, yes and no. Enchanting, intriguing. But there’s no real evidence that if you were on the surface of Pluto the sky would be blue, since the atmosphere is so thin. And the light is so meagre. Still a lovely sight

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