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Mariner 9
Mariner 9 (Mariner Mars '71 / Mariner-I) was an unmanned NASA space probe that contributed greatly to the exploration of Mars and was part of the Mariner program. Mariner 9 was launched toward Mars on May 30, 1971〔(【引用サイトリンク】 title=Mariner 9: Trajectory Information )〕 from Cape Canaveral Air Force Station and reached the planet on November 14 of the same year,〔〔 becoming the first spacecraft to orbit another planet〔(【引用サイトリンク】 title=Mariner 9: Details )〕 – only narrowly beating the Soviets' Mars 2 and Mars 3, which both arrived within a month. After months of dust storms it managed to send back clear pictures of the surface.
Mariner 9 returned 7329 images over the course of its mission, which concluded in October 1972.〔(NASA PROGRAM & MISSIONS Historical Log )〕
== Objectives ==
Mariner 9 was designed to continue the atmospheric studies begun by Mariner 6 and 7, and to map over 70% of the Martian surface from the lowest altitude () and at the highest resolutions (from 1 kilometer per pixel to 100 meters per pixel) of any Mars mission up to that point. An infrared radiometer was included to detect heat sources in search of evidence of volcanic activity. It was to study temporal changes in the Martian atmosphere and surface. Mars' two moons were also to be analyzed. Mariner 9 more than met its objectives.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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