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Elysium Planitia, located in the Elysium and Aeolis quadrangles, is a broad plain that straddles the equator of Mars, centered at .〔(USGS Gazetteer of Planetary Nomenclature ) entry for Elysium Planitia〕 It lies to the south of the volcanic province of Elysium, the second largest volcanic region on the planet, after Tharsis. The largest craters in this Elysium Planitia are Eddie, Lockyer, and Tombaugh. Elysium contains major volcanoes named Elysium Mons and Albor Tholus and river valleys--one of which, Athabasca Valles may be one of the youngest on Mars. On the east side is an elongated depression called Orcus Patera. A 2005 photo of a locale within Elysium Planitia at 5° N, 150° E by the Mars Express spacecraft shows what may be ash-covered water ice. The volume of ice is estimated to be by in size and deep, similar in size and depth to the North Sea. The ice is thought to be the remains of water floods from the Cerberus Fossae fissures about 2 to 10 million years ago. The surface of the area is broken into 'plates' like broken ice floating on a lake. Impact crater counts show that the plates are up to 1 million years older than the gap material, showing that the area solidified much too slowly for the material to be basaltic lava. The InSight mission is expected to land on Elysium Planitia in September 2016. ==Gallery== File:Wikiterracimmeriaboundaries.jpg|MOLA map showing boundaries of Elysium Planitia and other nearby regions. File:29389knoblayers.jpg|Layers around streamlined knob, as seen by HiRISE under HiWish program. File:ESP 036510 1735layers.jpg|Mounds with layers, as seen by HiRISE under HiWish program. Location is east of Gale Crater in the Aeolis quadrangle. File:Wikiesp036510 1735layersmound.jpg|Mound showing layers at the base, as seen by HiRISE under HiWish program. Location is east of Gale Crater in the Aeolis quadrangle. File:Wikiesp036510 1735layersyardang.jpg|Yardangs showing layers, as seen by HiRISE under HiWish program. Location is east of Gale Crater in the Aeolis quadrangle. File:40795 1815mesa.jpg|Mesas and eroded parts of mesas showing layers and dark slope streaks, as seen by HiRISE under HiWish program. Image is located in eastern Avernus Colles. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Elysium Planitia」の詳細全文を読む スポンサード リンク
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