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As far as I'm aware, there's no direct evidence of an atmosphere at the current time. The abstract of Sicardy et al. (2011) "A Pluto-like radius and a high albedo for the dwarf planet Eris from an occultation" gives a limit of ~1 nanobar on the presence of methane, argon or nitrogen atmospheres during the stellar occultation observed in November 2010. ...

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They're often called jet streams, but the visible bands you see in Jupiter are probably more like Hadley cells. Convection currents that move heat from lower in the planet's surface to higher before cooling and circling back downward. The darker bands are rising warmer atmosphere, the lighter bands, made lighter in color by more ice, are falling. https://...

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There are two effects causing this: The relevant quantity for determining whether or not a photon interacts with a particle is the ratio $$x \equiv \frac{2\pi r}{\lambda},$$ where $r$ is a size of the scattering agent. Rayleigh scattering When $x\ll 1$, we're in the Rayleigh regime where the wavelength is so long compared to the particle that the ...

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Reddening (or the fact that blue light is more extincted than red, causing objects to appear more red) is due to the interaction between the light and the dust grains and gas molecules it is going through, and is caused by the relative size of the dust grains and of the wavelength. Indeed, dust grains are very effective at scattering light which has a ...

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