Mars orbiter captures a Red Planet scar longer than the Grand Canyon.

The European Space Agency (ESA) has released new images of a 600-kilometer scar on Mars' surface called Aganippe Fossa. The scar is a graben, a ditch-like groove with steep walls, and was likely formed by magma rising underneath the Tharsis volcanoes, causing the planet's crust to stretch and crack. The name Aganippe Fossa is derived from classical mythology and appears at the base of Mars' largest volcano, Arsia Mons. The images were captured by the ESA's Mars Express orbiter, which has been studying Mars since 2003 and provides detailed information about the planet's surface features. [Extracted from the article]