WIRED ScienceNASA's New Horizons Probe Prepares To Make History—Again
Way, way out at the cold, dark edges of the solar system—past the rocky inner planets, beyond the gas giants, a billion miles more remote than Pluto—drifts a tiny frozen world so mysterious, scientists still aren't entirely sure if it's one world or two. Astronomers call it Ultima Thule, an old cartography term meaning "beyond the known world.
