Gravity

Yes, we must proceed carefully. I need a few days or weeks perhaps to think. I think this is a major paradigm change in foundations of theoretical physics. Lenny Susskind and others have built their entire legacy on the mistaken belief in unitarity that v

A decade-long NIST experiment has produced a new measurement of the universal gravitational constant that differs unexpectedly from another leading result, deepening a 225-year-old physics puzzle. The discrepancy is tiny, but for one of nature's most fund

Researchers at ETH Zurich and the Paul Scherrer Institute have produced an intense, cold beam of exotic atoms. They aim to use this to test a fundamental principle of Einstein's theory of gravity - the universality of free fall.

As we venture into longer-term missions, the altered gravity may reorganize our brains in unexpected ways, research suggests.

Physicists have directly observed a long-predicted quantum effect of gravity, putting one of Einstein's foundational ideas to a striking new test. Using ultracold atoms, researchers split an atom's quantum wave so that one part was held in place while the

Physicists including Roger Penrose observed gravity's effect on a falling quantum object for the first time, confirming Einstein's theory holds up in the quantum world.