Venus Craters
Venus Craters
Venus Craters
Venus Craters
Venus Craters

Venus Craters

Courtesy of NASA/JPL

http://photojournal.jpl.nasa.gov/feature/adivar+crater


Many of the impact craters of Venus revealed by Magellan have characteristics unlike craters on any other planetary body. This 30-km (18.6-mi) diameter crater, named Adivar crater for the Turkish educator and author Halide Adivar (1883-1964), is surrounded by ejected material which appears bright in the radar image due to the presence of rough fractured rock.

A much broader area has also been affected by the impact, particularly to the west of the crater. Radar-bright materials, including a jet-like streak just west of the crater, extend for over 500 km (310 mi) across the surrounding plains. A darker streak in a horseshoe shape surrounds the bright area. Radar-dark (i.e., smooth) streaks were observed around craters in earlier Magellan images, but this is a rare bright crater streak. These unusual streaks, seen only on Venus, are believed to result from the interaction of crater materials (the meteoroid, ejecta, or both) and high-speed winds in the upper atmosphere. The precise mechanism that produces the streaks is poorly understood, but it is clear that the dense atmosphere of Venus plays an important role in the cratering process.