Astronomers have recently made an exciting discovery in the Kuiper Belt, a region beyond Neptune consisting of icy bodies in the outer solar system. They have found a large, flat-topped mound of material that is approximately 300 kilometers wide and 1.5 kilometers high. This mound, known as Arrokoth, is believed to be made up of two separate objects that collided and merged together in the distant past. It is the most distant and most primitive object that has been explored in our solar system, and its discovery provides insight into the formation of our solar system billions of years ago.

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source: Phys.org