We’ve been told by science that the universe is expanding relentlessly, driven by a mysterious force called dark energy.

That the universe is expanding has been known for almost a hundred years now, but how fast? The exact rate of that expansion ...

We've known that the universe is expanding since 1929, and that its expansion is accelerating since 1998. The culprit behind ...

Physicist Sean Carroll explains how physics, astronomy, philosophy, and classics all help us understand the expanding ...

For the last 25 years, most scientists have believed that about 70% of the universe is formed by something called ‘’dark ...

Today we are going to talk about cosmology and the fact that black holes were considered as an almost unbelievable idea. In the 30s, British astronomer Arthur ...

An expanding universe complicates this picture just a little bit, because the universe absolutely refuses to be straightforward. Objects are still emitting light, and that light takes time to travel ...

It's well established that the universe is expanding, but there's serious disagreement among scientists over how fast it's happening.

Add Yahoo as a preferred source to see more of our stories on Google. In space, there are four dimensions: length, width, height and time. scaliger/iStock/NASA via Getty Images Plus About a century ...

A physicist proposes that the universe is not empty space, but is a viscous fluid, fueling the expansion and contraction we see.