Curvilinear Ridge in Terra Meridiani
HiRISE PICTURE OF THE DAY: 20 OCTOBER 2019

A Ridge in Terra Meridiani

This image shows a ridge in Terra Meridiani. The ridge is most likely a former streambed, now exposed in inverted relief; the wandering path is not expected for an exhumed fault or volcanic dyke. The stream that formed this ridge must have been ancient as the ridge is buried by brighter rocks, which are themselves very old, having been thickly deposited and then heavily eroded.



Enigmatic Canyon Dunes
This image shows a cross-section of ancient canyon systems in east Coprates Chasma, and shows several generations of wind-driven dunes and ripples.

Boundary Condition Controls on the High-Sand-Flux Regions of Mars
It is often unclear where and why sediment is mobile on today’s Mars. A new paper takes a deeper look.

Beautiful Mars, Beautiful Book
It’s the most beautiful book of Mars ever: “Mars: The Pristine Beauty of the Red Planet” is a unique look at the Red Planet by the most powerful camera sent to another world. Order your copy today!