SMRTR Science & EngineeringFeb 19, 2026Scientific American

The Kuiper Belt is packed with weird peanut-shaped objects. Astronomers think they know why

SMRTR summary

Astronomers have solved the mystery of why many objects in the Kuiper Belt have strange peanut-shaped forms with two lobes instead of spherical shapes. New computer simulations show these "contact binaries" formed directly from single collapsing dust clouds 4.6 billion years ago, rather than from two separate objects slowly merging together as previously thought.

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