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

Gravity is one of four fundamental interactions. The most precise description of this force is still provided by Einstein's General Theory of Relativity, published in 1915, an entirely classical ...

Large masses – such as a galaxy – curve space-time. Objects move along a geodesic. If we take into account that space-time itself has quantum properties, deviations arise (dashed line vs. solid line).

How can it be that the Moon's mass is a little over 1 percent of Earth's mass, while its gravity is about 17 percent of Earth ...