J’ai toujours aimé le désert. On s’assoit sur une dune de sable. On ne voit rien. On n’entend rien. Et cependant quelque chose rayonne en silence. .. Le petit prince – Antoine de Saint-Exupéry La Nasa a dévoilé une image du satellite Mars Reconnaissance Orbiteur (MRO pour les intimes) qui montre une belle dune d’un bleu cobalt . La photo aurait été effectuée en janvier dernier mais n’a été publiée que récemment, courant juin. Des dunes noires sont connus sur Mars ,ainsi que des dunes rouges évidemment mais là c’est une nouveauté. Les commentaires sur la composition de cette dune bleue sont assez limités:elle serait formée par une accumulation de substrat plus fin ou de matériaux différents (de l’environnement local) selon la Nasa . La dune bleue est située dans la région du cratère Lyot . En fait l’image est améliorée comme indiqué sur le site de la Nasa et celui, du Jet Propulsion Labotary (où on trouve les détails concernant cette photographie): [...]
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