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 ...

A subtle gravitational-wave “hum” from merging black holes may help settle the cosmic fight over how fast the universe is ...

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 ...

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

For decades, astronomers have known that the universe is expanding. To determine how fast it is growing today, scientists calculate a value called the ...

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

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

Cosmology is puzzled as to why two methods for measuring the expansion of the cosmos yield different results. A third method ...

For over a century, the world’s greatest minds could map the heavens, but not weigh the Earth. Newton’s theory had a missing number, and many believed it could never be found.

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

"We have long treated the Planck scale like a blurry limit," said Kulkarni. "But if you treat space as an information storage medium, geometry dictates a specific packing efficiency. The universe has ...