New measurements using gravitational lensing suggest the universe’s current expansion rate does not agree with signals from ...

Three thought experiments involving “demons” have haunted physics for centuries. What should we make of them today?

Current physics is speeding toward a breaking point, as astronomers confirm that the Hubble tension in new data.

Four UC Nobel laureates on what they discovered here, why it matters, and why their world-changing work could only have ...

Scientists are testing a novel way to measure cosmic expansion using time delays in gravitationally lensed quasars. Their ...

In the end, the Universe becomes a place where gravity and quantum physics slowly turn all mass into faint streams of particles.

A team of astronomers using a variety of ground and space-based telescopes including the W. M. Keck Observatory on Maunakea, ...

There is an important and unresolved tension in cosmology regarding the rate at which the universe is expanding, and ...

Confusing Momentum with Kinetic Energy: While both are related to motion, momentum is a vector, and kinetic energy is a ...

On Earth, knowing the time feels simple. Your phone pings the same second as a GPS satellite and an atomic clock in a lab.

A small star named M82 X-2 breaks physical barriers, as NASA's NuSTAR confirms it shines 10 million times brighter than the ...