In: Physics
Einstein's general theory of relativity is conceptually quit different from Newtown's theory of gravity ...this is problem 2-4 of Fundmental Planetary Science
Einstein's theory of gravity and Newtons theory are the gravtitational theories that explain the force of gravity.
Newtons theory explains how the force of gravity depends on the masses and the seperation between them, that force is directly proportional to the product of masses and inversely proportional to the square of the distance between them. It says as how much force one body has on the other. Acording to this, a high mass body exerts more gravity than by a lighter mass. From newtons view, for the gravty, we need mass. without mass, there is no gravity.
Einsteins theory is different from newtons theory. According to Einstein, Gravity is the curvature in space-time. the more massive the object, the more curvature it produces in space-time. It states that with the more massive object bending the spacetime, the light also bends causing the gravitational lensing.
Now, newtons theory can be written in terms of spacetime curvature,but it would not define the effects like Gravitational waves, gravitons, speed limit of light for gravity etc.