Chasma
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In planetary nomenclature, a chasma is a deep, elongated, steep-sided depression. As of 2020, the IAU has named 122 such features in the Solar System, on Venus, Mars, Saturn's satellites Mimas, Tethys
False-color image of Candor Chasma showing locations of hydrated sulfate deposits, as seen by Mars Odyssey THEMIS. Red colors show rocky places. Greens and blues show sandy, dusty areas.
Melas Chasma, as seen by THEMIS. Click on image to see relationship of Melas to other features.
Ophir Chasma wall, as seen by HiRISE.
Ius Chasma, as seen by HiRISE. Click on image to see layers.
Dione (moon)
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Dione is the fourth-largest moon of Saturn. With a mean diameter of 1,123 km and a density of about 1.48 g/cm3, Dione is composed of an icy mantle and crust overlying a silicate rocky core, with rock
Chasma
…depression. As of 2020, the IAU has named 122 such features in the Solar System, on Venus (63), Mars (25), Saturn's satellites Mimas (6), Tethys (2), Dione (8) and Rhea (5), Uranus's satellites Ariel (7), Titania (2) and Oberon (1) and Pluto's satellite Charon (3). An example is Eos Chasma on Mars. Below…
Dione photographed by the Cassini spacecraft in 2008
Giovanni Domenico Cassini, discoverer of Dione
Size comparison of Earth, the Moon, and Dione.
Dione in true color.