patwylam 發表於 2011-12-7 19:45:29

What is gravity in General Relativity?

In 1687,Isaac Newton published his law of universal gravitation, states that mathematically: F=G(m1m2/r^2), where G is a constant.

How about gravity in General Relativity?

Is it the curvature of the space ?

Astrosing 發表於 2011-12-9 17:20:12

Hi
In general relativity gravity is the curvature of the space-time. There is no
gravitational force, like in the Newtonian mechanics, but the space-time is
curved, and the particles (like planets, for example) move on their paths not
because there is a force acting on them, but because they follow the curvature
of the space-time.

(Thanks for Harko's teaching)
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