Why are Neptune and Uranus Different Colors? by BrianKoberlein
Uranus and Neptune are similar planets in many ways. Both are ice giant worlds, both have atmospheres rich in methane, and both have a bluish color. But while Uranus has a pale blue-green hue, Neptune has a deep blue color. But why? Why would two planets so similar in size and composition appear so different? According to a recent study, the answer lies in their aerosols.
Aerosol particles can be so small that their diameters are roughly the same as the wavelengths of visible light. Because of this, the way light scatters off them can depend on the light’s wavelength. Through a process known as Mie scattering, long red wavelengths usually scatter more than shorter blue wavelengths. Mie scattering is why Mars often has a tan sky rather than a blue one, and why.
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