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486958 Arrokoth (provisional designation 2014 MU69; formerly nicknamed Ultima Thule[a]) is a trans-Neptunian object located in the Kuiper belt. Arrokoth became the farthest and most primitive object in the Solar System visited by a spacecraft when the NASA space probe New Horizons conducted a flyby on 1 January 2019.[17][18][19]
It is indeed really primitive looking! Like a thing you'd find on the art table at a daycare.