“Asteroids come from the asteroid belt in outer space.”
Yep. Jupiter’s gravity occasionally sends hunks of rock from the asteroid belt our way. The only thing this study seems to have done is narrow it down to one part of the asteroid belt.
What ruins my day is the thought of a rogue planets passing through the outer reaches of our system and shaking things up. Or worse, say, rogue asteroids from outside of our solar system (Oumuamua perhaps being a vanguard of some cluster of rocks headed our way buckshot style.)