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.)
Anything that made it to space as ejecta from the KT Asteroid impact did so as molten debris