Arachnoid (astrogeology)

In astrogeology, an arachnoid /əˈræknɔɪd/ is a large geological structure resembling a spider web.

They appear as concentric ovals surrounded by a complex network of fractures, and can span 200 kilometers.

[3] One possible explanation is that an upwelling of magma from the interior of the planet pushed up on the surface, causing cracks.

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

This article relating to geology, geography or other features of the planet Venus is a stub.