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NEPTUNE

Crescent Neptune and Triton

Credit: Voyager 2, NASA

from http://apod.nasa.gov/apod/ap060618.html

Neptune: Once Around

Credit: NASA, ESA, Hubble Heritage Team (STScI / AURA)

from http://apod.nasa.gov/apod/ap110714.html

Le Son de Neptune enregistré par la sonde Voyager

mise en ligne par Vladimir Ilitch, vue sur Youtube

Neptune vue par Hubble

Neptune vue par le télescope spatial Hubble, entourée de quatre satellites, Protée (en haut), Larissa (la plus à gauche), Galatée (en bas à droite) et Despina (à gauche de Neptune et en bas à droite de Larissa).

from http://fr.wikipedia.org/wiki/Satellites_naturels_de_Neptune

Two Hours Before Neptune

Credit: Voyager 2, NASA

from http://apod.nasa.gov/apod/ap150215.htmllivepage.apple.com

Explanation: Two hours before closest approach to Neptune in 1989, the Voyager 2 robot spacecraft snapped this picture. Clearly visible for the first time were long light-colored cirrus-type clouds floating high in Neptune's atmosphere. Shadows of these clouds can even be seen on lower cloud decks. Most of Neptune's atmosphere is made of hydrogen and helium, which is invisible. Neptune's blue color therefore comes from smaller amounts of atmospheric methane, which preferentially absorbs red light. Neptune has the fastest winds in the Solar System, with gusts reaching 2000 kilometers per hour. Speculation holds that diamonds may be created in the dense hot conditions that exist under the cloud tops of Uranus and Neptune. Twenty-six years later, NASA's New Horizons is poised to be the first spacecraft to zoom past Pluto this July.