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Encyclopedia > Maat Mons
Maat Mons is displayed in this three-dimensional perspective view of the surface of Venus. Based on Magellan probe radar images

Maat Mons is the highest volcano on the planet Venus. The volcano is 8 km (5 miles) above the mean planetary radius and is found at 0.9° N 194.5°E. It is named after the Egyptian goddess of truth and justice, Maàt. Magellan spacecraft at Kennedy Space Center The Magellan spacecraft carried out a mission from 1989-1994, orbiting Venus from 1990-1994. ... A planet (from the Greek πλανήτης, planētēs which means wanderer or more forcefully vagrant, tramp) is a body of considerable mass that orbits a star and that produces no energy through nuclear fusion. ... (*min temperature refers to cloud tops only) Atmospheric characteristics Atmospheric pressure 9. ... A volcano is a geological landform (usually a mountain) where magma (rock of the earths interior made molten or liquid by high pressure and temperature) erupts through the surface of the planet. ... In Egyptian mythology, Maàt was the goddess of truth, justice and order as well as a word referring to those concepts she represents. ...



Maat Mons has a large summit caldera, 28×31 km in size. Within the large caldera there are at least five smaller collapse craters, up to 10km in diameter. For information of the town in the Elders Scrolls computer game Morrowind, click here Caldera. ... The word crater may refer to A landform resembling a pit or depression in the topography that can be formed in several ways: speculation exists that a meteorite impact with another body can cause an impact crater, an electrical discharge on any scale tends to form circular craters, volcanic activity...

A chain of small craters 3-5 km in diameter extends some 40 km along the south west flank of the volcano, but rather than indicating a large fissure eruption, they seem to also be formed by collapse: full resolution imagery from the Magellan probe reveals no evidence of lava flows from these craters. Fissure (Latin fissura, Plural fissurae) is a groove, natural division, deep furrow, or cleft found in the brain, spinal cord, and liver; or an unnatural tract found most commonly in the anus. ... Magellan spacecraft at Kennedy Space Center The Magellan spacecraft carried out a mission from 1989-1994, orbiting Venus from 1990-1994. ...

At least two large scale structural collapse events seem to have occurred in the past on Maat Mons.


Radar sounding by the Magellan probe revealed evidence for comparitively recent volcanic activity at Maat Mons, in the form of ash flows near the summit and on the northern flank. This long range radar antenna (approximately 40m (130ft) in diameter) rotates on a track to observe activities near the horizon. ... Diamond Head, a well-known backdrop to Waikiki in Hawaii, is an ash cone that solidified into tuff Volcanic ash is the term for very fine rock and mineral particles less than 2 mm in diameter that are ejected from a volcanic vent. ...

Intriguingly for planetary geologists, atmospheric studies carried out by the Pioneer Venus probes in the early 1980s revealed a considerable variation in the concentrations of sulphur dioxide (SO2) and methane (CH4) in Venus' middle and upper atmosphere. One possible explanation for this was the injection of volcanic gases into the atmosphere by plinian eruptions at Maat Mons. Astrogeology is the scientific discipline concerned with the geology of the celestial bodies such as the planets and their moons, asteroids, comets, and meteorites. ... Atmosphere may refer to: a celestial body atmosphere, e. ... The Pioneer mission to Venus consisted of two components, launched separately: an Orbiter and a Multiprobe. ... Events and trends The 1980s marked an abrupt shift towards more conservative lifestyles after the momentous cultural revolutions which took place in the 1960s and 1970s and the definition of the AIDS virus in 1981. ... Sulfur dioxide (or Sulphur dioxide) has the chemical formula SO2. ... The simplest hydrocarbon, methane, is a gas with a chemical formula of CH4. ... Eruption of Vesuvius in 1822. ...

Although many lines of evidence suggest that Venus is likely to be volcanically active, present-day eruptions at Maat Mons have not been confirmed.


  1. Robinson C.A., Thornhill G.D., Parfitt E.A. (1995), Large-scale volcanic activity at Maat Mons: Can this explain fluctuations in atmospheric chemistry observed by Pioneer Venus?, Journal of Geophysical Research, v. 100, p. 11755-11764
  2. Mouginis-Mark P.J. (1994), Morphology of Venus Calderas: Sif and Maat Montes, Abstracts of the 25th Lunar and Planetary Science Conference, held in Houston, TX, 14-18 March 1994., p.949

External links

  • 3D Perspective View of Maat Mons (http://photojournal.jpl.nasa.gov/catalog/pia00254)

  Results from FactBites:
Catalog Page for PIA00106 (277 words)
Maat Mons is displayed in this computer generated three-dimensional perspective of the surface of Venus.
The view is to the south with the volcano Maat Mons appearing at the center of the image on the horizon and rising to almost 5 kilometers (3 miles) above the surrounding terrain.
Maat Mons is located at approximately 0.9 degrees north latitude, 194.5 degrees east longitude with a peak that ascends to 8 kilometers (5 miles) above the mean surface.
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