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History
Casius quadrangle
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The Casius quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. The quadrangle is located in the north-central portion of Mars' eastern hemisphere and covers 60° to 120° east longitude and 30° to 65° north latitude. The quadrangle uses a Lambert conformal conic projection at a nominal scale of 1:5,000,000 (1:5M). The Casius quadrangle is also referred to as MC-6. Casius quadrangle contains part of Utopia Planitia and a small part of Terra Sabaea. The southern and northern borders of the Casius quadrangle are approximately 3,065 km and 1,500 km wide, respectively. The north to south distance is about 2,050 km. The quadrangle covers an approximate area of 4.9 million square km, or a little over 3% of Mars' surface area.
The Casius Quadrangle (MC-6). The southwest contains Nilosyrtis Mensae (faults, measa and buttes). The rest is mostly smooth plains.
The Casius Quadrangle (MC-6). The southwest contains Nilosyrtis Mensae (faults, measa and buttes). The rest is mostly smooth plains.
Patterned ground in the form of polygonal features is associated with ground ice. It is rare to be found this far south (45 degrees north latitude). P
Patterned ground in the form of polygonal features is associated with ground ice. It is rare to be found this far south (45 degrees north latitude). Picture taken by Mars Global Surveyor.
Field of low center polygons near crater, as seen by HiRISE under HiWish program. These features are common where the ground freezes and thaws.
Field of low center polygons near crater, as seen by HiRISE under HiWish program. These features are common where the ground freezes and thaws.
Periglacial Forms in Utopia, as seen by HiRISE. Click on image to see patterned ground and scalloped topography.
Periglacial Forms in Utopia, as seen by HiRISE. Click on image to see patterned ground and scalloped topography.
Utopia Planitia
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Utopia Planitia is a large plain within Utopia, the largest recognized impact basin on Mars and in the Solar System with an estimated diameter of 3,300 km (2,100 mi). It is the Martian region where the Viking 2 lander touched down and began exploring on September 3, 1976, and the Zhurong rover touched down on May 14, 2021, as a part of the Tianwen-1 mission. It is located at the antipode of Argyre Planitia, centered at 46.7°N 117.5°E. It is also in the Casius quadrangle, Amenthes quadrangle, and the Cebrenia quadrangle of Mars.
Martian terrain
Martian terrain
Scalloped ground, as seen by HiRISE under HiWish program. A study published in Icarus, found that the landforms of scalloped topography can be made by
Scalloped ground, as seen by HiRISE under HiWish program. A study published in Icarus, found that the landforms of scalloped topography can be made by the subsurface loss of water ice by sublimation under current Martian climate conditions. Their model predicts similar shapes when the ground has large amounts of pure ice, up to many tens of meters in depth.
Close up of scalloped ground, as seen by HiRISE under HiWish program. Surface is divided into polygons; these forms are common where ground freezes an
Close up of scalloped ground, as seen by HiRISE under HiWish program. Surface is divided into polygons; these forms are common where ground freezes and thaws. Note: this is an enlargement of a previous image.
Scalloped ground, as seen by HiRISE under HiWish program.
Scalloped ground, as seen by HiRISE under HiWish program.