Je vous transporte au pole sud de Mars

 
En utilisant des images capturées sur plusieurs longueurs d'onde par le satelite Mars Express Orbiter de l'Agence spatiale européenne, il a été possible de créer cette image magnifique de la calotte polaire sud de la planète rouge. Mais le plus interessant est l'explication de cette image :
 
Ce que vous voyez comme une zone blanche est une vaste région ou se présente de la glace, de l'eau gelé en permanence sur plusieurs kilomètres d'épaisseur, et couverte en hiver par une couche de quelques mètres de profondeur de dioxyde de carbone gelé, communément appelé de la glace sèche. Lors d'un été martien, la température au niveau du pôle devient suffisamment élevée pour sublimer la glace sèche en gaz, mais la glace d'eau reste congelée. Toute la glace sèche ne disparaît pas, et même en hiver, sur cette calotte glaciaire, la glace d'eau sous-jacente est beaucoup plus épaisse que la glace sèche.
 
 
Komrod

Komrod

Publié le Lundi 9 septembre 2013 à 11:30
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