NASA's New Horizons observations of Kuiper Belt

Ancient objects in the Kuiper Belt like Ultima Thule, a medieval term which means beyond the known world, hold clues to the formation of planets and the "third zone" of our solar system in which they reside, the wide expanse beyond the giant planets. Ultima Thule, officially known as 2014 MU69, orbits the Sun from more than a billion miles beyond Pluto.