Gravity is a result of curved spacetime.
Gravity is directly proportional to mass.
Gravity is inversely proportional to radius.
All of these are correct.
|||In GR, gravity is a result of the curvature of space-time.聽 Unaccelerated objects moving through flat space-time move in straight lines, but in curved space-time they move in curves.
Pick up "Gravitation" by Misner, Thorne and Wheeler for some relatively accessible explanations of this.|||As per these concepts when a car travels on earth it would travel in space time.and the car is held to the earth by space time curvature. Its a complicated concept which requires concrete and experimental explanation.
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|||You're right, gravity is a result of curved spacetime, because planets that have mass occupy a region of space, and in that region, if you look at it from a 3 dimensional grid, you'll see that the object causes a curve in that region, thus things traveling through the curve will change direction, thus never traveling in a straight line. In fact, there is no such thing as a straight line in this universe as according to relativity.
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