There is an important and unresolved tension in cosmology regarding the rate at which the universe is expanding, and ...

We know that planets rotate, but what about the universe as a whole? No, the universe doesn't appear to rotate; if it did, time travel into the past might be possible. Although people throughout ...

Adjust the colors to reduce glare and give your eyes a break. Use one of the services below to sign in to PBS: You've just tried to add this video to My List. But first, we need you to sign in to PBS ...

Time dilation: It’s a staple of science fiction, and whether you’re familiar with the term or not, you’ve probably encountered it in print or film. Fly fast enough to the speed of light, and your ...

Every time Sonam publishes a story, you’ll get an alert straight to your inbox! Enter your email By clicking “Sign up”, you agree to receive emails from ...

Forget one Big Bang — try many. A bold new theory pokes holes in the popular origin story, suggesting the universe evolves through a series of lightning-fast bursts, rewriting what we know about ...

How big is the universe? The question has been debated for centuries with no decision. Some theorists think that the universe is infinitely large, with galaxies extending forever into infinite space.

Symmetrical Universe. Stannard’s reverse-time universe is his carefully considered answer to a question that has long disturbed scientists. In a universe where every other phenomenon seems largely ...