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

Learn how Hubble is measuring the expansion rate of the Universe in this new explainer from NASA's Goddard Space Flight ...

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

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

Explore the compelling evidence behind the universe's expansion in this insightful video. Learn about the key scientific observations, including redshift, supernovae, and cosmic microwave background ...

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

New data from major dark-energy observatories suggest the universe may not expand forever after all. A Cornell physicist calculates that the cosmos is heading toward a dramatic reversal: after ...

Most messages are press releases about astronomical discoveries—okay, scratch that; most of them are spam, but science announcements are an easy second place. But I also get questions from readers ...

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

“For the last 20 years, people believed that the cosmological constant is positive, and the universe will expand forever,” says Tye, a professor emeritus at Cornell. A positive constant acts like a ...

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 ...

The “horizon” he points to isn’t a doorway to the divine, other scientists say. Yet, modern physics has been trying to answer questions once left to religion.