So after watching the tv show titles "Elegant Universe" narrated by Brian green. and after reading his book with the same name among other books of similar interest, I've had a brain storm. According to M-theory strings are opened ended strings that are connected to the universe at each end as they vibrate. gravity however is the only string, according to m-theory, that is a closed loop string able to traverse our brane of our 3dimensional universe. So i was thinking about relativity and how it says that the solar bodies bend the space time. What i have come to think is that maybe the accumulation of matter in space does not bend space time. What if the concentration of mass/energy affects gravitons and its that bends space and time not the matter. think of it like air pressure on a body in the atmosphere. Sort of explains why close to large bodies gravity is most powerful. Now to throw something into the gears, can we create a dense concentration of energy to create a local gravity field that is independent from earths. in other words can we make a "craft" appear massless in reference to earths gravity for travel purposes.