The constancy of the speed of light is a pillar of modern physics, but questions persist about its absolute universality.

It is something like the "Holy Grail" of physics: unifying particle physics and gravitation. The world of tiny particles is ...

General Relativity reinterprets the force of gravity not as a traditional force but as a manifestation of the curvature of spacetime. Its formulation rests on a rigorous mathematical framework built ...

General Relativity, Einstein’s revolutionary theory of gravity, reinterprets gravitational interactions as phenomena emerging from the curvature of spacetime rather than as forces in the traditional ...

In the present paper, we carried out a systematic investigation of pseudo-quasi-conformal curvature tensor has been made on the four-dimensional spacetime of general relativity. The spacetime ...

In 1907, Albert Einstein had his “happiest thought” — people in free fall do not feel their own weight. This simple idea laid the foundation for his general theory of relativity, which Einstein ...

Forbes contributors publish independent expert analyses and insights. The Universe is out there, waiting for you to discover it. Matter tells space how to curve, and curved space tells matter how to ...

The supermassive black hole at the center of the Milky Way is the most extreme astrophysical object located within a million light-years of Earth. With an estimated four million solar masses, it's the ...

On Aug. 21, the continental U.S. will be treated to a total solar eclipse that will dazzle the nation as it progresses from coast to coast, starting in Oregon and ending in South Carolina. The event ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. At least 3,700 years ago, Babylonian mathematicians approximated the ratio of a circle's ...