NASA's New Horizons Flies By Ultima Thule, 4 Billion Miles From Earth

About 33 minutes past midnight, NASA's New Horizons spacecraft passed close to the mysterious object Ultima Thule, a billion miles past Pluto and 4 billion miles from Earth. It's the farthest object ever explored by humanity. Here & Now's Robin Young talks with Kelly Beatty (@NightSkyGuy), senior editor at Sky & Telescope magazine.