This artist's impression shows the first-known interstellar object to visit the solar system, 'Oumuamua, which was discovered on October 19, 2017, by the Pan-STARRS 1 telescope in Hawaii, U.S., with subsequent observations from ESO's Very Large Telescope in Chile and other observatories around the world. PHOTO BY REUTERS/European Southern Obervatory/M. Kornmesser