Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still ...

The rapid acceleration of the universe’s expansion continues to challenge our understanding of fundamental physics. Why the ...

Quantum theory and Einstein's theory of general relativity are two of the greatest successes in modern physics. Each works ...

A deeply disturbing and controversial line of thinking has emerged within the physics community. It's the idea that we are reaching the absolute limit of what we can understand about the world around ...

Thanks to Einstein’s relativity, time flows differently on Mars than on Earth. NIST scientists have now nailed down the ...

A newly discovered celestial object may be a starless cloud that could change how astronomers understand dark matter.

When black holes collide, the impact radiates into space like the sound of a bell in the form of gravitational waves. But ...

Black holes are among the most fascinating and enigmatic objects in the universe. Born from collapsed stars and governed by ...

Engineers have found a way to shepherd microrobots with no wires, no radios, and no onboard computers. Instead, they steer them with light patterns designed using the same math physicists use to ...

But there are several important anomalies, including a widely debated one called the Hubble tension. It is named after Edwin ...

In the mid-19th century, Bernhard Riemann conceived of a new way to think about mathematical spaces, providing the foundation ...