A sample of galaxies dating to the first 2 to 3 billion years of the universe contain much heavier elements, and appear to be far hotter, than scientists expected.
Clouds of silicate sand exist high in exoplanet WASP-107b's atmosphere, new James Webb Space Telescope observations reveal.
Sharks are older than dinosaurs and even trees. What's the secret to their long evolutionary success?
A newly described Cretaceous dinosaur had puny arms like Tyrannosaurus rex, though the two species were not closely related.