Scientists have peered into the early days of the universe, when it was about 1 billion years old, and discovered that things moved in slow motion compared with now.The finding supports Albert ...

Mathematically, the main difference between the scenarios is the behavior ... but at least two potentially testable theories plausibly hold that the universe--and therefore time--existed well before ...

We live in a golden age for learning about the universe. Our most powerful telescopes have revealed that the cosmos is surprisingly simple on the largest visible scales. Likewise, our most powerful ...

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.

Here’s what you’ll learn when you read this story: A backward, mirror universe could explain the existence of dark matter. If an anti-universe exists, it would run backward in time, before the Big ...