# Where does gravity originate?

Does it emanate strictly from energy dense regions of space? What does that mean? Is it possible to, say, arrange clumps of matter in such a way as to create a virtual gravity well in space where there is no matter?

Say I somehow gather up a number of stars with total mass greater than the Chandrasekhar limit and set them into an orbit within a light year of each other such that they won't collide. I then wait a year at their geometric center. What would happen to me by the end of that year? Would some kind of virtual black hole suddenly appear out of nowhere?

$${\bf G} = {\bf T}$$
where $\bf G$ is the Einstein tensor that describes the curvature, i.e. the gravity, while $\bf T$ is the stress-energy tensor. So the origin of gravity is the stress-energy tensor. This is typically dominated by mass, but includes less obvious contributions like pressure and momentum.