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/
That would be wild…an asteroid returning fossils (surely fossils were blasted into space, not that I’m suggesting anything balsted into space can fossilize.)