萬有引力既形成...到而加為止...愛因斯坦定牛頓岩?

Gravitational force is one of the four fundamental forces in nature (the other three forces are electromagnetic force, strong nuclear interaction and weak nuclear interaction). Sir Isaac Newton only succeedded in dervied a law (the Law of Gravitation) in calculating gravitational force, but he failed to explain the nature of such force (why such a force exists in nature?).

It is until Einestein, in the year 1915, published his General Theory of Relativity. In the theory, it is postulated that any massive object produces a space-time curvature at its vicinity. Such curvature of space-time will be observed as if there is a force pulling other objects nearby towards the massive object.

The most famous experiements to prove the Relativity Theory were the observed precession of the perihelion of mercury(水星近日點的轉移) and the observed bending of light from a distant star by the sun during a solar eclipse.

Experiments attempting to verify the General Theory of Relativity are still on going. At least, up the this moment of time, the Theory is found to be valid in extreme situations close to very massive stellar objects, like qusars, neutron stars or even black holes.

牛頓萬有引力既形成.
is him.