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arachnoid


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A cobweb-shaped landform on Venus showing radiating lineaments centred on a volcanic dome and surrounded by concentric ridges or fractures. Arachnoids are up to 150 km in diameter and occur mostly in two lowland regions of Venus, Sedna Planitia and Ganiki Planitia. Other sparse groupings are known.

Subjects: Astronomy and Astrophysics — Biological Sciences.


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