The bright colors of the northern lights are dictated by the chemical composition of Earth's atmosphere. "Every type of atom or molecule, whether it's atomic hydrogen or a molecule like carbon dioxide, absorbs and radiates its own unique set of colors, which is analogous to how every human...
Also, Mercury has no moons but is a fully-fledged planet like Earth. All the gas planets, including Jupiter and Neptune, have rings of dust. Jupiter's and Neptune's rings are not as big as those of Saturn and Uranus. 4 A planet does not have to have an atmosphere, but all the ...
On average, Uranus radiates the same amount of energy as an ideal, perfectly absorbing surface at a temperature of 59.1 kelvins (K; −353 °F, −214 °C). Temperature decreases with decreasing pressure—i.e., with increasing altitude, where it is about 52 K (−366 °F, −221 ...