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date: 09 May 2021

Syrtis Major 

Source:
A Dictionary of Astronomy
Author(s):
Ian RidpathIan Ridpath

The most prominent dark marking (albedo feature) on Mars, roughly triangular, about 1000 km wide and 1200 km long, centred at +10° lat., 290° W long. It is the Greek name for the Gulf of Sirte on the north African coast, whose shape it resembles, and means ‘the great sand-bank’. It is an area of dark basalt rock sloping gently downwards from west to east with a variable covering of wind-blown dust. It contains regions with hydrated minerals, evidence for surface water in the past. It was first sighted by ... ...

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