A 10-year effort to measure gravity, a fundamental force in the universe, has failed to come up with a conclusive answer.

Sound has a speed limit. Under normal circumstances, its waves can travel no faster than about 36 kilometers per second, physicists propose October 9 in Science Advances. Sound zips along at different ...

An ultraprecise new measurement has given some weird particle physics theories a black eye. By measuring one of nature’s most fundamental constants more precisely than before, scientists have tested ...

Paving the way for transforming the world's measurement system, an international task force has determined updated values for four fundamental constants of nature. Paving the way for transforming the ...