?: Interstellar Object (Oumuamua)

?Oumuamua is the first interstellar object detected passing through the Solar System. Formally designated 1I/2017 U1, it was discovered by Robert Weryk using the Pan-STARRS telescope at Haleakalā Observatory, Hawaii, on 19 October 2017, approximately 40 days after it passed its closest point to the Sun on 9 September. When it was first observed, it was about 33 million km (21 million mi; 0.22 AU) from Earth (about 85 times as far away as the Moon) and already heading away from the Sun.

?Oumuamua is a small object estimated to be between 100 and 1,000 metres (300 and 3,000 ft) long, with its width and thickness both estimated between 35 and 167 metres (115 and 548 ft). It has a red color, like objects in the outer Solar System. Despite its close approach to the Sun, it showed no signs of having a coma, the usual nebula around comets formed when they pass near the Sun. Further, it exhibited non?gravitational acceleration, potentially due to outgassing or a push from solar radiation pressure.

______________________________________________

Brief Conclusion

'Oumuamua is considered strange because it is the first confirmed interstellar object to visit our solar system, and it exhibits unusual behavior, including a highly elongated, cigar-like shape, a lack of a visible cometary tail despite showing signs of acceleration, and an unexpected trajectory that suggests it might be propelled by something other than just the Sun's gravity, leading some to speculate about non-natural origins like an alien space craft.