An early binary star system model I made while writing First Earth that shows the sun and a theoretical dead star that share a binary orbit. Chances for comet and asteroid impacts would increase when the two systems made their close approach. The following images show the sequence of two stars surrounded by Oort clouds, approaching each other, swinging around each other, and then separating as they follow the outer tracks of a binary orbital system. I think our sun is part of a binary star system. I think the other star is a dead star that birthed the sun long ago.
Click here to see how the Sun might have been birthed during the death of an older star.
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The image below shows the most dangerous point in the orbital motion for our Solar System. The Sun (in gold) is passing across the orbital track of the dead star. Any trojans following the dead star could be in the path of the solar system and could collide with any planet in the Solar System with little warning.