Doing so would give a single, defined measure of what equals mass and stop the debate. That kind of accounting won’t stop mass shootings, but accurately weighing the gravity is important.

A device that can measure the gravitational force on a particle that weighs less than a grain of pollen could help us understand how gravity works in the quantum world. Despite keeping you stuck ...

A bundle of magnets and glass had a slight but detectable gravitational pull, pushing scientists closer to the boundary between classical and quantum physics.

Scientists wanted to measure the gravity on the surface of Mars, but the Curiosity rover lacks sensors for such measurements.