Dinosaurs were in decline when asteroid hit, egg study says

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. CNN  —  It’s a hard-fought paleontological debate. Did the massive asteroid that struck Earth 66 million years ago wipe out a thriving and diverse population of dinosaurs, or were they already struggling to survive when … Read more

One of Webb Telescope’s Tools Has a Glitch

A view of Webb’s secondary mirror, captured during the telescope’s cryogenic testing. Photo: Ball Aerospace The Webb Space Telescope has been dutifully beaming back incredible images of the cosmos since its “perfect” alignment earlier this year—but nothing is entirely perfect, even a $10 billion telescope. One of Webb’s observing mechanisms has apparently run into a … Read more