The giant Borealis basin around the Martian north pole may have formed due to an impact with an asteroid twice the size of Ceres.

Name: The giant Borealis basin around the Martian north pole may have formed due to an impact with an asteroid twice the size of Ceres.
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The Borealis basin is thought to have been formed by an impact with an asteroid or comet that was about twice the size of Ceres, which is the largest asteroid in the asteroid belt.

The Giant Borealis Basin Around the Martian North Pole May