Go with the Flow
Go with the Flow
ESP_020822_2220  Science Theme: Aeolian Processes
This image shows flows with rather large ridges extending down off of the central mountains of Moreux Crater.

What made those flows? It doesn't look like lava, and the central mountains are not volcanoes--they were thrust up by the impact event. Instead, it may be that these were flows of ice, or glaciers. There are lots of boulders on the surface, and glaciers tend to carry lots of rocks.

The Shallow Radar (SHARAD) experiment on MRO is able to penetrate through ice, confirming that many features such as this one are composed of ice, with a thin cover on non-icy material. The existence of glaciers on Mars was controversial more than 10 years ago, but not today.

So far we have seen no evidence for currently active glaciers on Mars, but maybe they are moving very slowly. This image is actually a repeat image of this site.

Written by: Alfred McEwen  (3 February 2011)
Acquisition date
04 January 2011

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
296.7 km (184.4 miles)

Original image scale range
from 30.6 cm/pixel (with 1 x 1 binning) to 61.1 cm/pixel (with 2 x 2 binning)

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
73°, with the Sun about 17° above the horizon

Solar longitude
211.3°, Northern Autumn

For non-map projected images
North azimuth:  96°
Sub-solar azimuth:  328.3°
Black and white
map projected  non-map

IRB color
map projected  non-map

Merged IRB
map projected

Merged RGB
map projected

RGB color
non-map projected

Black and white
map-projected   (545MB)

IRB color
map-projected   (307MB)

Black and white
map-projected  (276MB)
non-map           (191MB)

IRB color
map projected  (85MB)
non-map           (237MB)

Merged IRB
map projected  (160MB)

Merged RGB
map-projected  (155MB)

RGB color
non map           (248MB)
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

B&W label
Color label
Merged IRB label
Merged RGB label
EDR products

IRB: infrared-red-blue
RGB: red-green-blue
About color products (PDF)

Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible:

NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA’s Science Mission Directorate, Washington. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.