UN NUAGE BLEU SUR MARS :
Mars est censé être rouge. Mais lorsque l’astronome amateur Thomas Williamson a regardé le 26 octobre, il a vu une couleur différente. ‘Le pôle nord était bleu électrique’, dit-il.
Williamson a photographié le North Polar Hood, un nuage géant de glace d’eau qui se forme
au-dessus du pôle nord martien pendant l’hiver. Pourquoi bleu ? C’est la couleur de la lumière du soleil diffusée par de très petits cristaux de glace (plus petits que la longueur d’onde
de la lumière elle-même) flottant dans le nuage.
‘Mars était incroyable à travers mes binoculaires sur mon Newtonien de 12,5 pouces f/5,1 à environ 400x !’ dit Williamson. ‘J’attends avec impatience les prochaines semaines alors que
Mars augmente en taille apparente.’
En effet, la vue est sur le point de s’améliorer alors que la Terre et Mars convergent pour une rencontre rapprochée le 1er décembre. D’ici là, Mars doublera de luminosité pour atteindre
une magnitude de -1,9 (plus lumineuse que Sirius) et augmentera de taille à 17,2 secondes d’arc. Cherchez la planète rouge et sa cagoule bleue se levant à l’est après le coucher du soleil
dans la constellation du Taureau : sky map.
Info de la Source Publié * ICI
In 1987 Greenpeace established the ‘World Park Base’ in Antarctica which stayed until 1991
The main Bbase building was constructed in 1987 from prefabricated units, which were designed and manufactured by a German polar construction and engineering company. Between 1988 and 1990 several structures were added. Eventually, basebuildings consisted of an L-shaped main building and a small food storage and emergency building. The main building comprised an accommodation unit housing a common living area, four separate bedrooms, a bathroom, radio room, medical and science room, coat room and a room containing snow melting equipment. A cold porch was also attached. The engine room was housed in the same building, separated from theother facilities by a walkway. A lean-to was used for storage. The short side of the L-shaped building was formed by another unit joined to the main building by a walkway which housed a workshop, science lab, dark room and field equipment store. The latter unit, called the FOS hut, had been acquired from the Footsteps of Scott Expedition which had previously had a base at the site. 
The original base was designed to accommodate four persons. In later years, a workshop and laboratory building and two more bedrooms were prefabricated and added to the original structure as it became apparent that extra space was needed for the wintering teams. These additions were simple to construct andinstall, with minimum excavation necessary. Also installed on the base was amateur radio equipment for contact with Ham radio enthusiasts worldwide, and a Uosat satellite link that was part of a scientific project run in conjunction with the University of Sussex in the United Kingdom.
