Mysterious 'Oumuamua Object Still Baffles Scientists 4 Years After Discovery It's been four years since astronomers first detected 'Oumuamua, an unusual object hurtling through our solar system. The interstellar visitor has left scientists with more questions than answers, sparking intense debate about its composition, origin, and purpose. Measuring around 400 meters in length, 'Oumuamua is unlike any known asteroid or comet, with a peculiarly elongated shape and a surface that appears to change color. Researchers continue to study the enigmatic object, seeking clues that could redefine our understanding of the universe and its many mysteries.