The conversation between human and AI assistant.
[|Human|] Can you generate a 2 lines abstract of this text?
[|AI|] In general physics theory (Newton), Gravity is a mutual attraction between objects based on their respective masses and the square of the distance which separates them. In the relativity theory (Einstein), it's a curvature of the spacetime generated by the objects themselves.
[|Human|] 
Can you generate a 2 lines abstract of this text?