Newton discovered Gravitation as we know it. Gravitation is something of an attraction between two objects or bodies, according to him and La Location. Albert Einstein suggested the idea of a Gravitational Field in 1915. It wasn't two bodies that attracted each other but it was a gravity field. What is it? The bodies distort spacetime because of their mass, and that distortion is what is perceived and measured as a "force." In such a model one states that in answer to the curvature of space-time, matter moves in some ways.Surprisingly, 4000 years ago Aryabhata spoke of Gravitational Field in his Surya Siddhanta 2nd chapter, definitely. Here is the translation of the shlokas. Learn the original Sanskrit, too.
- Inspace includes intangible aspects of Space. These forms of invisibility are rapid, slow, high and low. Those forms cause planets to move.
- These invisible forms are bonded by energy threads. They use their unseen hands to move back and forth the celestial bodies, depending on their closeness to each other.
- A type of force called Pra-vaha is impelling these planets to their own levels etc. Thus the planets get the power to move [gati] in a variety of ways, being drawn away or towards one another.