Gravity has been tested extremely well inside the solar system. On cosmic scales, direct tests are harder. This study pushes ...

Scientists have detected the most massive merger of black holes ever. This titanic collision, "heard" in ripples in spacetime called gravitational waves, involves black holes so massive that it could ...

A new argument explores how the growth of disorder could cause massive objects to move toward one another. Physicists are both interested and skeptical. Isaac Newton was never entirely happy with his ...

Gravity, as most people understand it, is the familiar force that pulls a falling apple toward Earth. But for astronomers and ...