A bunch of asteroids near Jupiter and Neptune with orbits perpendicular to the plane of the solar system may have come here from a different star system
Source:
https://www.newscientist.com/article/2241631-we-may-have-found-19-more-interstellar-asteroids-in-our-solar-system/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home