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The sixteen equatorial quadrangles are the smallest, with surface areas of 4,500,000 square kilometres (1,700,000 sq mi) each, while the twelve mid-latitude quadrangles each cover 4,900,000 square kilometres (1,900,000 sq mi). The two polar quadrangles are the largest, with surface areas of 6,800,000 square kilometres (2,600,000 sq mi) each.
For example, the peak discharge required to carve the 28-km-wide Ares Vallis is estimated to have been 14 million cubic metres (500 million cu ft) per second, over ten thousand times the average discharge of the Mississippi River. [41] Mars Orbital Laser Altimeter (MOLA) derived image of Planum Boreum. Vertical exaggeration is extreme.
Molecular nitrogen (N 2) makes up 2.7 percent of the atmosphere. As far as we know, organic compounds are absent [ 17 ] except for a trace of methane detected in the atmosphere . [ 18 ] [ 19 ] On 16 December 2014, NASA reported the Curiosity rover detected a "tenfold spike", likely localized, in the amount of methane in the Martian atmosphere .
At their furthest Mars and Earth can be as far as 401 million km (249 million mi) apart. [191] Mars comes into opposition from Earth every 2.1 years. The planets come into opposition near Mars's perihelion in 2003, 2018 and 2035, with the 2020 and 2033 events being particularly close to perihelic opposition. [192] [193] [194]
The quadrangle is also referred to as MC-10 (Mars Chart-10). [1] Lunae Planum and parts of Xanthe Terra and Chryse Planitia are found in the Lunae Palus quadrangle. The Lunae Palus quadrangle contains many ancient river valleys. The quadrangle covers the area from 45° to 90° west longitude and 0° to 30° north latitude on Mars.
The Memnonia quadrangle is also referred to as MC-16 (Mars Chart-16). [1] The quadrangle is a region of Mars that covers latitude -30° to 0° and longitude 135° to 180°. [2] The western part of Memnonia is a highly cratered highland region that exhibits a large range of crater degradation. Memnonia includes these topographical regions of Mars:
Areography, also known as the geography of Mars, is a subfield of planetary science that entails the delineation and characterization of regions on Mars. [1] [2] [3] Areography is mainly focused on what is called physical geography on Earth; that is the distribution of physical features across Mars and their cartographic representations.
Official USGS Mars map; Basic Mars map image; List of quadrangles on Mars; Template:Basic Mars map; List of artificial objects on Mars#Landing site namings and memorials – (Mars Memorials) Template:Features and memorials on Mars – (Mars Memorials map) (Template – ImageMap coordinates) (Template – transclusions