Science and Exploration

A Small Crater on a Larger Crater’s Wall

By Keith Cowing
Press Release
June 28, 2017
Filed under ,
A Small Crater on a Larger Crater’s Wall
Small Impact Crater On A Larger Crater's Rim
NASA

It’s not that common to see craters on steep hills, partly because rocks falling downhill can quickly erase such craters.
Here, however, NASA’s Mars Reconnaissance Orbiter (MRO) observes a small impact has occurred on the sloping wall of a larger crater and is well-preserved.

Dark, blocky ejecta from the smaller crater has flowed downhill (to the west) toward the floor of the larger crater. Understanding the emplacement of such ejecta on steep hills is an area of ongoing research.

The map is projected here at a scale of 25 centimeters (9.8 inches) per pixel. [The original image scale is 24.8 centimeters (9.8 inches) per pixel (with 1 x 1 binning); objects on the order of 49.6 centimeters (19.5 inches) across are resolved.] North is up.

The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., Boulder, Colo. NASA’s Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Mars Reconnaissance Orbiter Project for NASA’s Science Mission Directorate, Washington.

Image credit: NASA/JPL-Caltech/Univ. of Arizona

SpaceRef co-founder, Explorers Club Fellow, ex-NASA, Away Teams, Journalist, Space & Astrobiology, Lapsed climber.