At high altitudes, Neptune's atmosphere is 80% hydrogen and 19% helium. A trace amount of methane is also present. Prominent absorption bands of methane exist at wavelengths above 600 nm, in the red and infrared portion of the spectrum. As with Uranus, this absorption of red light by the atmospheric methane is part of what gives Neptune its blue hue, although Neptune's vivid azure differs from Uranus's milder cyan. Because Neptune's atmospheric methane content is similar to that of Uranus, some unknown atmospheric constituent is thought to contribute to Neptune's colour. COUNT 5
QSN1 What is Neptune's atmosphere made of?  ANS1 80% hydrogen and 19% helium QSN2 Where are absorption bands of methane on Neptune?  ANS2 wavelengths above 600 nm QSN3 What gives Neptune it's blue hue?  ANS3 absorption of red light by the atmospheric methane QSN4 What planet also gets it's color from atmospheric constituent?  ANS4 Uranus QSN5 What color is Uranus, compared to Neptune?  ANS5 cyan