Cette semaine, jeudi 19 decembre a 10h12, l’Europe va mettre en orbite la mission spatiale la plus dingue et la plus importante de cette fin d’annee. Grace au telescope spatial Gaia, nous allons enfin cartographier en 3D la voie lactee avec une precision completement folle. Cette cartographie en 3D va nous permettre de connaitre les mouvements, les positions, les proprietes des etoiles de notre galaxie. Mais ce n’est pas tout…Tout d’abord, il faut bien faire la difference avec le telescope Hubble. Quand Hubble sert a observer, le telescope spatial Gaia sert a etablir des releves. Ce telescope va servir a recueillir des milliers de donnees sur chaque etoile. L’instrument de 3 metres de haut et de 10 metres de large est une belle bete ! Il va utiliser ses 2 telescopes en carbure de silicium pour detecter des objets 400 000 fois plus faibles que ceux visibles a l’?il nu. Et les etoiles les plus brillantes sont localisees avec une incroyable precision. Pour donner une idee, c’est comme si on parvenait a determiner l’epaisseur d’un cheveu humain a une distance de 1000 kilometres. Pendant sa duree de vie de 5 ans minimum, Gaia va recueillir 1 petaoctets de donnees. 700 milliards d’observations astrometriques (les positions), 150 milliards d’observations photometriques (les luminosites et les couleurs), 15 milliards d’observations spectroscopiques (l’energie en fonction de la longueur d’onde). Les donnees recueillies vont mobiliser 6 centres de traitements en Europe. Celui de Toulouse va etre capable de traiter environ 40% des donnees transmises par Gaia. Pour cela, ils ont fabrique un superordinateur capable de traiter 6000 milliards d’operation par seconde. Vous l’avez compris, cartographier la voie lactee, ce n’est pas coton. Avec le nouveau catalogue que Gaia constituera, la communaute scientifique etablira les nouvelles bases de l’astronomie. Pour info, je serai au CNES a Toulouse pour le lancement de Gaia et je visiterai egalement le local ou se trouve le superordinateur. Je vais livetweeter cet evenement, et je vous invite a me rejoindre sur Twitter si vous voulez vivre ce moment historique depuis le centre de controle toulousain. Mobilite : Archos tisse des liens capitaux avec Logic InstrumentLaisser un commentaire Annuler la reponse. Votre adresse de messagerie ne sera pas publiee. Bref, c’est corrige. Franchement, cette fin d’annee est riche en evenements scientifiques plutot encourageant pour notre comprehension de l’espace,et a terme (c’est encore tres loin je vous l’accorde !) pour notre conquete de nouvelles planetes a explorer. Bande de noobs. PC. Autant d'argent dans une console... No way. Voir les resultats Loading ... PicasaAdwCleanerAdobe Flash PlayerAPPLI V. » Plus d'emplois ... Android KitKat, Mac OS X Mavericks... NetMediaEurope © Copyright 2013 Agence Presse Magazine. Tous droits reserves. 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