A decade-long effort to measure one of physics’ most fundamental constants culminates in a moment of uncertainty and revelation.

The cosmological constant is the mathematical description of the energy that drives the ever-accelerating expansion of the ...

One issue is that when scientists calculate what the Hubble constant should be, it doesn’t quite match observations of the ...

A crucial number that rules the universe goes big in a strange quantum material. The fine-structure constant is about 10 times its normal value in a type of material called quantum spin ice, ...

Images made with the W.M. Keck Observatory in Hawaii show how light from two distant galaxies is distorted into multiple images. UC Davis astronomers have made a new estimate of the Hubble Constant, ...

Google's latest Doodle highlights quantum physics, showcasing the Bloch sphere and qubits. This celebrates World Quantum Day, ...

Sound has a speed limit. Under normal circumstances, its waves can travel no faster than about 36 kilometers per second, physicists propose October 9 in Science Advances. Sound zips along at different ...