What is mass? It seems like a synonym for weight, but that isn’t quite right. Weight is how we measure the pressure that gravity exerts upon things. But mass? Mass is the actual presence of an item — ...

Just over a week ago, European physicists announced they had measured the strength of gravity on the smallest scale ever. In a clever tabletop experiment, researchers at Leiden University in the ...

In this case, we can say that reconciling gravity and quantum mechanics is a big unknown, and likely to have some practical applications we can't anticipate. With that as a goal, we can then ...

Scientists have succesfully measured the direct influence of gravity on antimatter for the first time in history by dropping antihydrogen atoms from a magnetic trap, and observing as they annihalated ...