There are eccentric stars like Aida Carina which may be two or three stars in a tight orbit. There are unstable stars 200 or more times the mass of our sun that use up their hydrogen at such a rate that they blow up very quickly for a star. Then there are degenerate stars like
P Diddy.

We once suspected we had a nemesis brown dwarf star beyond the Oort cloud that caused debris to fall into the sun and caused mass extinctions on Earth when they would hit us. It is more likely that the orbit of our solar system orbiting through an arm of the Milky Way and encounters more intergalactic matter as it travels below, through, and above the sprial arm of our galaxy. We are currently in a dense area of a spiral arm. Maybe that's why we have tracked OUMAMUA which came from outside our solar system.