‘Oumuamua: The Visitor from Another Star That Refused to Behave

Artist's impression by ESO/M. Kornmesser of the interstellar object 'Oumuamua: a long, dark, cigar-shaped body tumbling through space with the Sun blazing behind it

About 6 min readIn October 2017, a telescope in Hawaii spotted something no one had ever seen: an object from another star system, tumbling through ours on a path that would never return. It was red, enormously elongated, showed no comet’s tail — and then it sped up, for no reason anyone could see. Nine years later, the debate about what it was has still not ended.