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Arachnoid (astrogeology)

From Wikipedia, the free encyclopedia
Large structure of unknown origin on Venus
Venusian arachnoid Trotula Corona[1]

Inastrogeology, anarachnoid/əˈræknɔɪd/ is a large geological structure resembling aspider web. They are of unknown origin, and have been found only on the surface of theplanet Venus. They appear asconcentric ovals surrounded by a complex network offractures, and can span 200 kilometers. Over 90 arachnoids have been identified on Venus.[2]

Arachnoids could be related tovolcanos, however it is also possible that different arachnoids are formed by different 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 tocoronae 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

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References

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  1. ^"Planetary Names: Corona, coronae: Trotula Corona on Venus".planetarynames.wr.usgs.gov. Archived fromthe original on 1 October 2015. Retrieved26 January 2022.
  2. ^Kostama, V.P. (2002)."The Four Arachnoid Groups of Venus"(PDF).Lunar and Planetary Science Conference: 1115.Bibcode:2002LPI....33.1115K – via lpi.
  3. ^This article contains text from theAstronomy Picture of the Day[1]. As a work of the United States Federal Government, it is in the public domain.
  4. ^"WTP: Venus: Arachnoids".pds.jpl.nasa.gov. Retrieved2017-04-06.
  5. ^Hamilton, Calvin J."Arachnoids".solarviews.com. Retrieved2017-04-06.
  6. ^Dawson and Crumpler."Characteristics of Arachnoids from Magellan Data"(PDF).Lunar and Planetary Institute Conference:383–384 – via LPSC.

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