You might be forgiven for thinking the above picture is the stump of a tree. Shift your perspective a little, however, and the truth becomes clear: What you're looking at is much bigger than any tree – a concave depression on the surface of Mars, g
The rings radiating out from the center of the crater are not tree rings – but just as tree rings can yield a glimpse into the history of a tree, so too can these crater rings help us to understand Mars.
It's this expansion and contraction, occurring repeatedly, that would create concentric fracture patterns across the crater floor, resulting in rings, and thus the illusion of a tree stump.
France Dernières Nouvelles, France Actualités
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