Scientists finally solve mystery of cigar-shaped comet Oumuamua after it was initially mistaken for a UFO

Astronomers were puzzled as the rock appeared to be accelerating in a way no one could explain

Artist's impression of the interstellar asteroid Oumuamua. Photo: M Kornmesser/ESO

Sarah Knapton

When the mysterious comet Oumuamua passed through the Solar System in 2017, its odd trajectory led some to speculate it might be an alien spacecraft.