Features only vaguely vi si bl e in Earth-based and Venera spacecraft images have become readily apparent in the recent Magellan images of Venus: bright flows, some hundreds of kilometers long, that have emanated from about 41 percent of the 747 impact craters in this study. On the Moon, relatively fresh craters have impact-me1 t deposits that pond on their flanks and occur as flows on their ballistic ejecta (l), and