Arachnoids

Arachnoids

Fig. 7.20 . An enlarged view of a Magellan mosaic of Bereghinya Planita (also see Figure 7.18), showing circular structures of up to 230 kilometers in diameter. Their central domes are surrounded by concentric and radial fractures. Such features have been informally dubbed arachnoids for their spider-web-like appearance. They are similar in form, but usually smaller than, the circular volcanic structures known as corona, shown in Figure 7.21. (Courtesy of NASA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University