Both Ancient and Modern
Both Ancient and Modern
ESP_061582_2010  Science Theme: Landscape Evolution
This image of the floor of an old impact crater in Arabia Terra shows evidence of multiple different geological processes, both ancient and modern.

The linear ridges and scarps formed eons ago, perhaps as fractures filled with lava or some other dark material that is more resistant to erosion than the surrounding materials in the crater floor. Boulders up to 3 meters in diameter are strewn downslope on both sides of the dark ridge near the center of the picture.

The nearby knob is the source of several long dark slope streaks. These dark streaks are probably caused by dust avalanches that remove bright dust and reveal the darker subsurface below. These streaks likely formed within the last few years, based on HiRISE observations of slope streaks elsewhere on Mars.

Written by: Paul Geissler (narration: Tre Gibbs)  (18 November 2019)
Acquisition date
15 September 2019

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
281.2 km (174.8 miles)

Original image scale range
56.8 cm/pixel (with 2 x 2 binning) so objects ~170 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
42°, with the Sun about 48° above the horizon

Solar longitude
80.3°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  21.1°
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   (189MB)

IRB color
map-projected   (106MB)

Black and white
map-projected  (99MB)
non-map           (88MB)

IRB color
map projected  (38MB)
non-map           (101MB)

Merged IRB
map projected  (212MB)

Merged RGB
map-projected  (196MB)

RGB color
non map           (95MB)
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/JPL/University of Arizona

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.