Clouds on Neptune. Planet Neptune, showing weather patterns in its atmosphere. Neptune appears mostly blue because of absorption of red light by methane gas in its atmosphere. Clouds above most of the methane absorption appear white whilst the very highest appear yellow-red. Areas which also absorb blue light appear green. The planet's equatorial jet stream appears as a dark blue band at upper centre. The gas in this jet travels at 1440 km per hour. Image taken by the Hubble Space Telescope using visible and infrared wavelengths. (The weather on the opposite side of the planet during the same rotation is shown on R420/075).