Join Dr. Marc Buie and Dr. John Spencer, both from SWRI and members of the NASA New Horizons mission to Pluto and beyond, in a tour of the furthest reaches of the solar system. After flying by Pluto in 2015, the New Horizons spacecraft continued deeper into the Kuiper Belt, a vast swarm of small bodies orbiting the sun beyond the orbit of Neptune. On New Year's Day 2019, New Horizons flew close to one of these objects, a 20-mile long pristine leftover from the solar system's formation. This object, nicknamed Ultima Thule, turned out to be unlike anything previously seen in the solar system.