# Distorting the space-time fabric

If point masses could be generated in a controlled manner distorting the fabric of space-time objects could be made to move in any direction relative to each other and not simply attract as is normally experienced. Imagine a rubber sheet stretched tight with a heavy mass [m1] at its center creating a gravitational well. Now add a point mass some distance away [m2] that distorts the rubber sheet creating a second well. m2 and objects close to it would move toward it and away from the m1. Could this be the basis for an anti-gravity effect? Envision water flowing across the surface of a rubber sheet distorted by a mass at its center; now place another mass [a marble] on the sheet some distance from the center causing another distortion, the flow of water close to the second mass changes, and flows away from the center and toward the second mass. If this distortion is made in space the effect would be anti-gravity would it not?

• It doesn't matter where you place mass, gravity is always attractive. Can you place the planet above your head and be attracted in the opposite direction than your antipode? Of course, just fly to Australia, that's exactly what it feels like. That's why they call it down-under. Apr 15, 2016 at 22:55
• Apr 15, 2016 at 23:56

An example of the sort of system you describe would be the Earth and the Moon, with the Earth playing the part of your mass $m_1$ and the Moon $m_2$. Neither of these are point masses, but courtesy of Gauss' law we know that the gravitational field of a sphere is the same as the gravitational field of a point mass provided you are farther away than the radius of the sphere.
• @Jim: please post a new question if you want to ask anything further. However note that GR makes no distinction between matter and energy - they are treated as equivalent using the famous equation $E=mc^2$. Also I think you'd need to make your question a lot clearer than your comment i.e. what does surf the gravitational wells mean? Apr 16, 2016 at 15:44