Ok let me see if I can frame this question correctly. I know that mass warps space but what I'm trying to find out is if anything else can warp space? I'm trying to figure out how a worm hole can form or how warp travel can be achieved. I watched the Peter Jennings show last night and as I was ROFLMAO, all of a sudden Dr. Kaku came on and I sat straight up and began to listen. When he explained worm holes and warping space I began to think about this interstellar travel thing a bit more seriously but then it hit me, matter warps space. After thinking along these lines for about 15 seconds I realized that there has to be something else that causes worm holes and the warping of space. So that is what's behind my question: What warps space?