Martian gullies

Martian gullies

. Narrow gullies are eroded into the north wall of a small crater, about 7 kilometers across, that is itself located on the floor of the larger Newton Crater, named after the British scientist Isaac Newton (1643-1727). Flowing water may have caused these gullies and transported debris downhill, creating the lobed and finger-like deposits on the floor and at the base of the crater wall (bottom center). The individual deposits were used to estimate that 2.5 million liters, or 660 thousand gallons, of water flowed down each gully. This image, taken from the Mars Global Surveyor, is about 4 kilometers across, and centered at 41.1 degrees south and 159.8 degrees west. (Courtesy of NASA, JPL and Malin Space Science Systems.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University