Astronomers observed a star wobbling around a spinning black hole, revealing rare evidence of Einstein’s frame-dragging ...

Physicist Brian Cox has rarely been shy about his enthusiasm for big, difficult ideas, but his reaction to a recent quantum ...

Neil deGrasse Tyson explains how gravity truly acts on falling objects, revealing the physics behind motion, acceleration, ...

Even worse, the orbit of Mars is elliptical (think of a slight oval rather than a perfect circle), which means that sometimes ...

The X‑arithmetic technique offers a powerful new way to map the physics of other galactic structures across the universe and ...

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

The longest gamma-ray burst ever observed has UNC Chapel Hill astronomers questioning the very nature of these cosmic ...

Neutrinos are low-mass subatomic particles with zero electric charge that interact with matter only via the weak nuclear force and gravity. This makes neutrinos difficult to detect, despite the fact ...

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

From a particle smasher encircling the moon to an “impossible” laser, five scientists reveal the experiments they would run ...

Galaxy clusters are the most massive objects in the universe held together by gravity, containing up to several thousand ...

For much of the twentieth century, scientists expected the expanding universe to slow over time. The opposite turned out to ...