The surface of Phobos, the largest moon in Mars, is covered with gigantic gutters caused by massive rocks rolling on the surface after the asteroid effect.
Kenneth Ramsley of Brown University in Rhode Island, there are other planets and verses with similar ditches and scratches, but none of them remains fully Phobos. The pits of the moon are 30 kilometers long and 200 meters wide.
At the same time, Ramsley and James Head in Brown used a simulation of the Phobos-Mars system to examine whether these gutters would come from rolling stones.
The couple says that these stones will be launched from the Stickney Crater, which occurred about 150 million years ago, when a rock struck Phobos about 1 kilometer.
The Phobos is small and close to Mars, so the planet's gravity moves on the rocks, causing some to roll over the moon and the intersecting lines we see on the surface today. Ramsley says the whole process will take less than 12 hours without a collision.
There is almost no line in the Moon. The simulation showed that this region had a lower height, and because Phobos had low gravity, it would be rolled into space like a cartoon character running down a cliff and descending to the other side before returning to the surface of the rock.
But there's one problem: we don't see any rock on the surface. Ramsley said it could be explained by the debris from Stickney's influence. Iy This extra rubble, which doesn't stay on the surface, is trapped in orbit around Mars, going back to the scene of the crime in 1000 years and then multiplying it to Phobos, “he says. This bombardment could shred the rocks and hide the smallest pits under a layer of dust.
Magazine reference: Planet and Space Sciences, DOI: 10.1016 / j.pss.2018.11.004
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