- #1
- 19,443
- 10,021
Who's got some ideas?
https://www.nasa.gov/image-feature/jpl/pia22348/formations-in-context-or-what-is-it
This image from NASA's Mars Reconnaissance Orbiter is a close-up of a trough, along with channels draining into the depression. Some HiRISE images show strange-looking formations. Sometimes it helps to look at Context Camera images to understand the circumstances of a scene -- like this cutout from CTX 033783_1509 -- which here shows an impact crater with a central peak, and a collapse depression with concentric troughs just north of that peak.
https://www.nasa.gov/image-feature/jpl/pia22348/formations-in-context-or-what-is-it