Help Shape the Future of Space Exploration

Join The Planetary Society Now  arrow.png

Join our eNewsletter for updates & action alerts

    Please leave this field empty
The Bruce Murray Space Image Library

Terraced crater on Mars

Filed under pretty pictures, amateur image processing, Mars, impact cratering, Mars Reconnaissance Orbiter

Go Back

Terraced crater on Mars The terraced floor of this crater makes it look like a nested pair of craters. In fact, it is a clue to a layered subsurface.

NASA / JPL / UA / Emily Lakdawalla

The original image has been processed to emphasize the fine structure of polygons and blocks in crater ejecta. The color image was overlaid on a contrast-stretched grayscale image. The center, smallest crater was processed separately so that its details would not be rendered too dark to be visible.

Caption by Shane Byrne from the HiRISE website: Small impact craters usually have simple bowl shapes, but sometimes more complicated shapes can occur if the target is unusual. The crater in the center of this HiRISE image is unusual because there is a wide, flat bench, or terrace, between the outer rim and the inner section, making it appear somewhat like a bullseye. Crater shapes like this can occur if material underground changes from weak to strong. In these cases, the level of the terrace shows where this change occurs. In the area covered by this observation, we have other reasons to suspect that the upper material is mostly ice. Terraced craters like this one show us how thick this ice is, as the terrace formation shows us where the ice meets the underlying rock.

Copyright holder: Emily Lakdawalla

Public domain

This image is in the public domain. Original image data dated on or about January 28, 2014

 

Other Related Images

Comments:

Leave a Comment:

You must be logged in to submit a comment. Log in now.

Space in Images

Pretty pictures and
awe-inspiring science.

See More

Join the New Millennium Committee

Let’s invent the future together!

Become a Member

Connect With Us

Facebook! Twitter! Google+ and more…
Continue the conversation with our online community!