A/2017 U1 (previously C/2017 U1 (PANSTARRS)) is a potentially interstellar object passing through the Solar System. It was discovered on extremely hyperbolic orbit on October 18, 2017 by the Pan-STARRS telescope, when the object was 0.2 AU (30,000,000 km; 19,000,000 mi) from Earth. Initially thought to be a comet, it…