Pluto planet
The blue color of the haze in Pluto's atmosphere is due to the diffusion of sunlight by very small particles. Researchers have attributed this effect to the presence of organic substances, tholins, in the planet's atmosphere. Tholines can be gray or red, but because of their size they reflect sunlight in such a way that the atmosphere appears blue. This color may indicate that there are many small dissolved substances in the planet's atmosphere, just like on our home planet.
Image from the New Horizons spacecraft.
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