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Chronology of discoveries of water on Mars : ウィキペディア英語版 | Chronology of discoveries of water on Mars Today, interplanetary spacecraft have provided abundant evidence of water on Mars, dating back to the Mariner 9 mission, which arrived at Mars in 1971. This article provides a mission by mission breakdown of the discoveries they have made. For a more comprehensive description of evidence for water on Mars today, and the history of water on that planet, see Water on Mars. == Mariner 9 == Mariner 9 imaging revealed the first direct evidence of water in the form of river beds, canyons (including the Valles Marineris, a system of canyons over about long), evidence of water erosion and deposition, weather fronts, fogs, and more.〔(【引用サイトリンク】title=Mars Exploration: Missions )〕 The findings from the Mariner 9 missions underpinned the later Viking program. The enormous Valles Marineris canyon system is named after Mariner 9 in honor of its achievements.
Image:Scamander Vallis from Mariner9.jpg|Meander in Scamander Vallis, as seen by Mariner 9. Such images implied that large amounts of water once flowed on the surface of Mars. Image:Warrego Valles from Mariner 9.jpg|Warrego Valles, as seen by Mariner 9. This image suggests that rain/snow was necessary to form this kind of branched network of channels.
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