How is it "illuminating the whole star system"?

It seems more likely that it'll act like a non intelligent hunk of rock going through some random trajectory.

It's less silly to declare you'll win the lottery. That has happened many times over - but we're yet to discover that can or has existed outside of Earth. While it's nearly impossible it hasn't happened several times over, it's so far impossible that we've encountered even the crumbiest excuse for life.

I assert that it is silly. We're not indigenous American happening upon European settlers. We're indigenous Americans wandering about the continent harassing mammoths, inventing stories of how it'll go when it happens.