In planetary geology, a tholus (pl. tholi) is a small domical mountain or hill. The word is from the Greek θόλος, which means a circular building with a conical or vaulted roof. The Romans transliterated the word into the Latin tholus, which means cupola or dome. In the early 1970s, the International Astronomical Union (IAU) adopted tholus as one of a number of official descriptor terms for topographic features on Mars and other planets and satellites. One justification for using neutral Latin or Greek descriptors was that it allowed features to be named and described before their geology or geomorphology could be determined. For example, many tholi appear to be volcanic in origin, but the term does not imply a specific geologic origin. Currently, the IAU recognizes 55 descriptor terms. (See Planetary nomenclature.) Tholi are present on Venus, Mars, and on Jupiter's moon Io.

  • Map of the Tharsis quadrangle showing major features, several of which are tholi. Tharsis contains many volcanoes, including Olympus Mons, the tallest known volcano in the solar system.

  • 2001 Mars Odyssey THEMIS mosaic of Ceraunius Tholus (lower volcano) and Uranius Tholus (upper volcano). Ceraunius Tholus is about as high as Earth's Mount Everest.

  • Western part of Jovis Tholus, as seen by THEMIS on Mars Odyssey spacecraft. Jovis Tholus is in the Tharsis quadrangle.

Read more about Tholus:  Examples of Tholi

Other articles related to "tholus":

Environment Around Ceraunius Tholus
... Ceraunius Tholus is on the Tharsis rise, also called the Tharsis bulge ... Ceraunius Tholus Channel, as seen by HiRISE ... The summit crater of Ceraunius Tholus is just to the right of this picture ...
Ceraunius Tholus
... Ceraunius Tholus is a volcano on Mars located in the Tharsis quadrangle at 24.25° north latitude and 262.75° east longitude, part of the Uranius group of volcanoes ... The slopes on Ceraunius Tholus are quite steep with an average slope of 8° with many radial erosion channels and pitted valleys extending from just below the rim of the ... Interesting features on Ceraunius Tholus are three large canyons at the northwest flank of Ceraunius Tholus which are up to 2.5 km wide and 300 m deep ...
List Of Geological Features On Venus - Tholi
... Name Latitude Longitude Diameter (km) Year named Name origin Akka Tholus 75.1 N 233.0 E 19.4 2009 Akka, Finnish mother goddess Alcyone Tholus 2.1S 256.4E 70.0 2003 Greek goddess who is the personification of ... Ale Tholus 68.2N 247.0E 87.0 1985 Igbo (Nigeria) goddess who created Earth and vegetation ... Amra Tholus 53.0N 98.0E 50.0 1997 Abkhazian sun deity ...
Tharsis Tholus
... Tharsis Tholus is an intermediate-sized shield volcano located in the eastern Tharsis region of the planet Mars ... In 1973, the International Astronomical Union (IAU) officially designated it Tharsis Tholus ... In planetary geology, tholus (pl ...