mmm, yeah, that's where it gets kinda heavy. Unified field theory...it's actually 'spacetime'. Kinda both the same thing....and gravity is the distortion that matter makes in 'spacetime', like a bowling ball on a trampoline. If you think about it, what is time but something moving through space? ..an event. Okay, I'll shut up now because this is where my brain takes a nose dive and I'm in over my head. Don't you guys what Star Trek?! ..lol