Oumuamua - Asteroid From Beyond

Pretty cool:

Such interstellar objects are thought to pass through our Solar System pretty frequently, but they’re usually moving too fast, and they’re usually too faint to see. With `Oumuamua, astronomers got lucky: the asteroid entered our Solar System at an angle, coming in close by the Sun, and then passed by Earth on its way out of the Solar System. That gave astronomers the chance to catch it with ground-based telescopes. “I think it’s really neat that we had this visitor, however briefly, and we had a chance to look at it up close,” says Meech.