asteroid, but refuted a 2021 hypothesis that the dinosaur killer was likely a comet. "Comets come from very far from the sun, but they're mostly made out of ice and dust," Tissot said.

In a new study published Thursday in the journal Science, researchers pieced together the chemical identity of the asteroid that fueled the planet’s fifth mass extinction event. The dino killer ...

The asteroid collision that killed the dinosaurs 65 million years ago may have been a major cosmic crack-up, but it was nothing compared to a bigger impact that occurred roughly four billion years ...

Striking along the coast of West Africa, this asteroid—which left behind the nine- kilometer-wide Nadir crater—would’ve been smaller than the original dino-killer, but its 500-meter-wide ...

The asteroid ... "dinosaur-killing" impact from a rock perhaps a half-mile across or larger happens on 100-million-year timescales. Astronomers have already found over 90 percent of the "planet ...

An asteroid nearly the size ... wiping out the dinosaurs and 75% of all species. By contrast, 2024 YR4 falls into the "city killer" category. "If you put it over Paris or London or New York ...