Arachnoid (astrogeology)

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Venusian „arachnoid” Trotula Corona[1]

In astrogeology, an arachnoid is a large geological structure resembling a spider web. They are of unknown origin, and have been found only on the surface of the planet Venus. They appear as concentric ovals surrounded by a complex network of fractures, and can span 200 kilometers. Over 90 arachnoids have been identified on Venus, so far.[2]

The arachnoid might be a strange relative to the volcano, however, it is also possible that different arachnoids are formed by other processes.[3] One possible explanation is that an upwelling of magma from the interior of the planet pushed up on the surface, causing cracks.[4] An alternate theory concerning their origin is that they are a precursor to coronae formation.[5]

Much of what is known about arachnoids is the result of studies performed by C.B. Dawson and L.S. Crumpler.[6]

See also[edit]


  1. ^
  2. ^ Kostama, V.P. (2002). "The Four Arachnoid Groups of Venus" (PDF). Lunar and Planetary Science Conference – via lpi.
  3. ^ This article contains text from the Astronomy Picture of the Day [1]. As a work of the United States Federal Government, it is in the public domain.
  4. ^ "WTP: Venus: Arachnoids". Retrieved 2017-04-06.
  5. ^ Hamilton, Calvin J. "Arachnoids". Retrieved 2017-04-06.
  6. ^ Dawson and Crumpler. "Characteristics of Aracnoids from Magellan Data" (PDF). Lunar and Planetary Institute Conference: 383–384 – via LPSC.

External links[edit]

This article incorporates text from a public-domain NASA website.