Title text:
Paleontologists have long worried that the dinosaurs blasted into space 66 million years ago will one day complete their orbits and fall back down.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3265/
Speaking of the antipode of Chicxulub, the Deccan Traps formed at about the same time.