Forgive me if I sound stupid here but is there anything that we could call Dead Space? An essence or quantum material that is traveling at zero velocity to everything? Something that we could say we are all traveling at x velocity relative to. I know we can all say we are traveling at such and such velocity relative to light but Guth said that the speed of light is relative to the compact density of the universe after the Big Bang. So if space-time has different densities in different areas of the universe; how can we say we are traveling at such and such velocity relative to anything at all? There's got to be some concept here that I'm not getting.