Observing Mars from orbit can help us understand the history of the planet, as recent MarsExpress images of an impact crater show.
While rovers visiting the surface of Mars are invaluable research tools for understanding surface chemistry and other questions, observing Mars from orbit can help us understand the planet’s history — as recent images of a martian impact crater show.
“The fossae were created as the summit of Alba Mons rose in elevation, causing the surrounding surface to become warped, extended, and broken,” ESA explains. “The Tantalus Fossae faults are a great example of a surface feature known as grabens; each trench formed as two parallel faults opened up, causing the rock between to drop down into the resulting void.”
The large crater shown in the images can be helpful in dating the grabens features. The crater would have been caused when a chunk of rock or ice came streaming through the thin atmosphere and hit the planet, throwing up debris and creating a shock wave that forms a circular shape in the surface rock. The force of this impact would obliterate any surface features which existed there previously.
France Dernières Nouvelles, France Actualités
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