Acidalia Planitia | Article about Acidalia Planitia by The Free Dictionary
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Acidalia Planitia (ass-ă-day -lee-ă) (formerly Mare Acidalium) The most prominent dark marking in the northern hemisphere of Mars; it is a low-lying area more than 2615 km in diameter located just below Mars' north pole and centered on the areographic coordinates 47° N latitude and 22° W longitude (see areography). Much of the region seems to be volcanic in origin and is thought to be covered by black sand resulting from the erosion of dark basalts. There is a preponderance of rampart craters (see Craters) in the area, and ice lies just below the surface. In Mars' distant past, Acidalia Planitia may have been the receptacle for water discharged from adjacent major outflow channels such as Ares Valles. See also Mars, surface features.
References in periodicals archive
For example, an area of lower gravity between Acidalia Planitia
and Tempe Terra was interpreted before as a system of buried channels that delivered water and sediments from Mars' southern highlands into the northern lowlands billions of years ago when the Martian climate was wetter than it is today.
The landing sites for "Ares 3" is on a Martian plain named Acidalia Planitia
Together with David Baker from Brown University, the researchers used instruments on NASA's Mars Reconnaissance Orbiter (MRO) to observe several of these structures in a northern region known as Acidalia Planitia