Undated European Southern Observatory handout image of an artistÕs impression showing the first interstellar asteroid: `Oumuamua. PRESS ASSOCIATION Photo. Issue date: Monday November 20, 2017. A lost interstellar asteroid has entered the solar system after wandering between the stars for hundreds of millions of years, scientists believe. The unique object, named Oumuamua, is highly elongated, about 400 metres (1,312 ft) long and coloured dark red. It is the first space rock from outside the sola