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出典:『Wikipedia』 (2011/04/20 06:51 UTC 版)

英語による解説

引用

Isidis Planitia is a plain located inside a giant impact basin on Mars, centered at 12°54′N 87°00′E / 12.9°N 87.0°E / 12.9; 87.0. It is the third biggest impact structure on the planet after the Hellas and Argyre basins – it is about 1500 km in diameter. Due to dust coverage, it typically appears bright in telescopic views, and was mapped as a classical albedo feature, Isidis Regio, visible by telescope in the pre-spacecraft era.