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Dawn

2007/9/27镜像同步8 回复

Launch Date: Sept. 27 Launch Window: 7:20 a.m. – 7:49 a.m. EDT Launch Coverage Begins at 5:15 a.m. Mars gravity assist March 2009 Vesta arrival September 2011 Vesta departure April 2012 Ceres arrival February 2015 End of primary mission July 2015 Spacecraft: Dawn Launch Vehicle: Delta II Launch Location: Cape Canaveral Air Force Station, Florida Launch Pad: Space Launch Complex 17-B Launch Date: Sept. 27 Launch Window: 7:20 a.m. – 7:49 a.m. EDT Launch Coverage Begins at 5:15 a.m. Mars gravity assist March 2009 Vesta arrival September 2011 Vesta departure April 2012 Ceres arrival February 2015 End of primary mission July 2015 During its nearly decade-long mission, the Dawn mission will study the asteroid Vesta and dwarf planet Ceres, celestial bodies believed to have accreted early in the history of the solar system. The mission will characterize the early solar system and the processes that dominated its formation. During the earliest epochs of our solar system, the materials in the solar nebula varied with their distance from the sun. As this distance increased, the temperature dropped, with terrestrial bodies forming closer to the sun, and icy bodies forming farther away. 转自NASAhttp://www.nasa.gov/mission_pages/dawn/mission/index.html 详细的去NASA网站看吧

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