Argyre Planitia


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Argyre Planitia

(ar -jÿr, air -) A 1000-km diameter basin in Mars' southern hemisphere, visible as a bright area to Earth-based observers and centered on the areographic coordinates 50° S latitude, 44° W longitude (see areography). Like Hellas Planitia it is probably an impact feature. See Mars, surface features.
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Two are near each other among the Nirgal Vallis riverbeds lying between the Valles Marineris canyon region, the huge Argyre Planitia basin, and the dark Margaritifer Sinus albedo feature.
Yet the southern hemisphere is relatively featureless, revealing "no clear indication" even of the huge Hellas basin or the vast plain named Argyre Planitia. Says Muhleman, "It is tempting (but dangerous) to say that this type of radar echo, whose physics is poorly understood, is primarily coming from relatively 'fresh' lava flows, except for the south pole." A great deal about Mars is yet to be learned, however, and Muhleman is not about to assert that the radar maps contain evidence for recent volcanic activity.