Big G, gravity, is the oldest fundamental constant in physics and the least clearly defined. One scientist has spent a decade ...

Scientists have announced the results of a decade-long quest to measure Newton’s gravitational constant, the force that keeps our feet on the ground and holds planets in orbit. Related video above: ...

The gravitational constant, dubbed big G, determines the strength of the attraction between two masses anywhere in the universe. Scientists have been trying to measure big G for over 225 years, but ...

The accelerating expansion of the universe is usually explained by an invisible force known as dark energy. But a new study suggests this mysterious ingredient may not be necessary after all. Using an ...

You may have heard people say that aboard the International Space Station (ISS) there's "zero gravity," but in fact, gravity is still very much present. The station orbits Earth at an altitude of ...