When you look up at the night sky, it appears unchanging. But if you look deep enough you will find that the sky is in fact ...

For years, cosmologists have argued over a simple question with an awkward answer: How fast is the universe expanding right ...

Using gravitational waves as a measure of the universe's rate of expansion could solve the biggest headache in physics, the ...

Astronomers have long known the universe is expanding—but exactly how fast remains one of the biggest mysteries in cosmology. Different techniques for measuring the Hubble constant stubbornly disagree ...

Last year, our most detailed map of the universe yet suggested our understanding of dark energy has been wrong for decades. The shock result is reigniting the search for a better cosmic story ...

We have known for several decades that the universe is expanding. Scientists use multiple techniques to measure the present-day expansion rate of the universe, known as the Hubble constant. These ...

Black holes that turn matter into energy could explain dark energy and answer two other cosmic questions. Now, the challenge ...

Stephen Hawking's profound insight reveals that imperfection is the universe's fundamental operating principle, not a flaw.

"The polarized light of the cosmic microwave background is sensitive to new physics that violates parity symmetry," the team ...

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.

New research suggests researchers should start by comparing parameters other than time.

This puzzle is known as the problem of time, and it remains one of the most persistent obstacles to a unified theory of physics. Despite enormous progress in cosmology and particle physics, we still ...