It’s been 120 years since Henry Cavendish measured the gravitational constant with a pair of lead balls suspended by a wire. The fundamental nature of gravity still eludes our best minds - but those ...

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

Scientists have measured gravity at an extremely short distance, in what they hope will tell us more about extra dimensions. The rest of this article is behind a paywall. Please sign in or subscribe ...

Physicists are quietly testing an audacious idea: that the mass of everything around us might not come from an invisible ...

A recent study has made strides toward solving one of physics’ biggest puzzles: including all known particles and interactions into the theory of quantum gravity. The solution is to modify the quantum ...

June 28 (UPI) --Many theoretical frameworks used to explain quantum gravity and other cosmological phenomena, including string theory, require extra dimensions. Some use spacetime as a single extra ...

Our universe has three spatial dimensions – or rather, three that our human senses can actively perceive. Some theories suggest there could be many more dimensions that we're unaware of, mostly ...

Although we now think of the universe as three bulky, nearly-flat dimensions, we might soon discover that the fabric of space-time consists of many more dimensions than we ever dreamed. Extra ...

Scientists have used a pulsed slow neutron beamline to probe the deviation of the inverse square law of gravity below the wavelength of 0.1 nm. The experiment achieved the highest sensitivity for a ...

PBS Space Time is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV, Amazon Fire Tablet, Roku, Samsung Smart TV, and ...

In our universe there is a big problem with gravity. It is far weaker than the other fundamental forces and scientists cannot explain why. One proposal is that its energy is leaking into other, ...