Ice lakes on Triton

Ice lakes on Triton

. The smooth, flat surface of this feature on the surface of Triton may have been filled with water ice. It is edged with overlapped terraces, as though the level of the lakes changed as the result of repeated flooding, partial removal and freezing. In Tritonís frigid world volcanoes erupt ice, rather than molten rock. The small pits and finely textured areas near the center of the lake-like features are probably associated with the most recent eruption of ice. This image, taken from the Voyager 2 spacecraft in August 1989, is about 500 thousand meters across. (Courtesy of NASA and JPL.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University