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Home > Art, Film & Photography > Programme Discovery: Messenger, Dawn, Stardust, Mars Pathfinder, Deep Impact, Epoxi, Gravity Recovery and Interior Laboratory, Kepler
Programme Discovery: Messenger, Dawn, Stardust, Mars Pathfinder, Deep Impact, Epoxi, Gravity Recovery and Interior Laboratory, Kepler

Programme Discovery: Messenger, Dawn, Stardust, Mars Pathfinder, Deep Impact, Epoxi, Gravity Recovery and Interior Laboratory, Kepler


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About the Book

Ce contenu est une compilation d'articles de l'encyclopedie libre Wikipedia. Pages: 45. Non illustre. Chapitres: MESSENGER, Dawn, Stardust, Mars Pathfinder, Deep Impact, EPOXI, Gravity Recovery and Interior Laboratory, Kepler, Chandrayaan-1, Genesis, Lunar Prospector, CONTOUR, Moon Mineralogy Mapper. Extrait: Le programme MESSENGER (en anglais: ) est une mission d'etude de la planete Mercure de l'agence spatiale americaine de la NASA. La sonde spatiale, lancee en 2004, se place en orbite autour de la planete le 18 mars 2011. L'objectif de la mission est d'effectuer une cartographie complete de la planete, d'etudier la composition chimique de sa surface et de son exosphere, son histoire geologique, sa magnetosphere, la taille et les caracteristiques de son noyau ainsi que l'origine de son champ magnetique. Mercure, planete la plus proche du Soleil, est quasiment inexploree: MESSENGER n'a ete precedee que par la sonde qui a survole la planete a trois reprises en 1974 et 1975. Les donnees que la mission va collecter doivent contribuer a affiner la connaissance des mecanismes de formation et d'evolution du systeme solaire. La mise en orbite d'une sonde autour de Mercure necessite, en vol direct, de pouvoir reduire la vitesse orbitale de la sonde de . Aussi, jusqu'a l'arrivee de MESSENGER, aucune sonde n'a ete placee en orbite autour de Mercure. Les progres realises dans le domaine de la mecanique spatiale dans les annees 1980 et 1990 ont permis de mettre au point des trajectoires balistiques et indirectes exploitant l'assistance gravitationnelle des planetes qui permettent de placer une sonde en orbite autour de Mercure en ayant recours a des phases propulsives limitees. Durant son transit de sept ans vers la planete, MESSENGER a effectue ainsi six survols rapproches des planetes interieures (la Terre, Venus a deux reprises et Mercure a trois reprises) avec quelques corrections de trajectoire intermediaires, ce qui lui a permis de limiter la masse de carburant emb...


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Product Details
  • ISBN-13: 9781159906481
  • Publisher: Books LLC, Wiki Series
  • Publisher Imprint: Books LLC, Wiki Series
  • Height: 246 mm
  • No of Pages: 46
  • Spine Width: 3 mm
  • Weight: 100 gr
  • ISBN-10: 1159906483
  • Publisher Date: 25 Aug 2011
  • Binding: Paperback
  • Language: French
  • Returnable: N
  • Sub Title: Messenger, Dawn, Stardust, Mars Pathfinder, Deep Impact, Epoxi, Gravity Recovery and Interior Laboratory, Kepler
  • Width: 189 mm


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