How is Arrokoth so flat?

Arrokoth (recently nicknamed Ultima Thule) is certainly an unusual object and is found deep in our solar system.
In fact it is the farthest object in our Solar System, to date, that has been visited by a spacecraft (excluding any alien craft that may or may not exist).
New Horizons did a close flyby on 1st January 2019 and provided some incredible imagery…

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