Gravity

A decade-long experiment by NIST measured the universal gravitational constant, revealing a persistent discrepancy with other leading results and deepening a long-standing physics mystery.

Scientists have created a controlled beam of muonium, an exotic atom, to test if gravity affects second-generation particles as Einstein's theory predicts.

Physicists exploring quantum collapse models suggest that time may have an inherent, albeit tiny, uncertainty, potentially linking quantum mechanics and gravity.