Mysterious 'Oumuamua Object Remains a Cosmic Enigma After 5 Years It's been five years since astronomers first detected 'Oumuamua, an unusual, cigar-shaped object that hurtled through our solar system, leaving scientists with more questions than answers. Initially thought to be a comet or asteroid, further analysis has failed to provide a conclusive explanation for its origins and composition. As researchers continue to study this interstellar visitor, new theories have emerged, including the possibility that it's a piece of an alien spacecraft or a natural phenomenon that defies our current understanding of the universe.