Arachnoid (astrogeology)

In astrogeology, an arachnoid /əˈræknɔɪd/ 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.^[2]

Arachnoids could be related to volcanos, 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 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]

References

^ "Planetary Names: Corona, coronae: Trotula Corona on Venus". planetarynames.wr.usgs.gov. Archived from the original on 1 October 2015. Retrieved 26 January 2022.
^ Kostama, V.P. (2002). "The Four Arachnoid Groups of Venus" (PDF). Lunar and Planetary Science Conference: 1115. Bibcode:2002LPI....33.1115K – via lpi.
^ 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.
^ "WTP: Venus: Arachnoids". pds.jpl.nasa.gov. Retrieved 2017-04-06.
^ Hamilton, Calvin J. "Arachnoids". solarviews.com. Retrieved 2017-04-06.
^ Dawson and Crumpler. "Characteristics of Arachnoids from Magellan Data" (PDF). Lunar and Planetary Institute Conference: 383–384 – via LPSC.

External links

NASA Astronomy Picture of the Day: Arachnoids on Venus (20 January 1998)

Venus

Outline of Venus

Geography

General

Regions

Regio	Alpha Regio Asteria Regio Beta Regio Ovda Regio
Terrae	Aphrodite Terra Ishtar Terra Lada Terra

Mountains
and
volcanoes

Plains and
plateaus

Canyons and
valleys

Craters

Other

Astronomy

General	Aspects Orbit Phases
Transits	1639 1761 1769 1874 1882 2004 2012
Asteroids	Venus-crosser asteroids Venus trojans Zoozve

Exploration

Past	Sputnik programme Sputnik 7 Venera program Venera 1 Sputnik 19 Sputnik 20 Sputnik 21 Kosmos 21 Venera 1964A Kosmos 27 Venera 2 Venera 3 Kosmos 96 Venera 4 Kosmos 167 Venera 5 Venera 6 Venera 7 Venera 8 Kosmos 482 Venera 9 Venera 10 Venera 11 Venera 12 Venera 13 Venera 14 Venera 15 Venera 16 Mariner program Mariner 1 Mariner 2 Mariner 5 Mariner 10 Zond program Zond 1 Pioneer Venus Pioneer Venus Orbiter / Pioneer 12 Pioneer Venus Multiprobe / Pioneer 13 Vega program Vega 1 Vega 2 Magellan IKAROS Shin'en Venus Express Akatsuki
Gravity Assists	Galileo Cassini–Huygens MESSENGER BepiColombo Jupiter Icy Moons Explorer (planned) MBR Explorer (planned)
Planned	DAVINCI EnVision VERITAS Venus Orbiter Mission Venus Life Finder
Proposed	European Venus Explorer Venera-D VAMP VISE VISAGE VICI VOX
Proposed (crewed)	Colonization Inspiration Mars (flyby) Terraforming
Other	Geological mapping of Venus Artificial objects on Venus

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