Thanks for replying Tim and Richard...I was just wondering on some things...why spacetime is a term in the sense that it is an intermingled concept...elements of space and time meshed together...we can think of space as one part and time as another part. Seems to be a lot of characterizations of space, but I really haven't seen much characterization of time. I was also thinking in context of Dark Matter and Dark Energy as I heard just recently. Are these entirely new concepts? I just heard about them within the last 5 years I think. Was there development of these concepts earlier than that?
It seems that Dark Matter could be just normal matter as we know it, but it is "buried" in time, and interactions with space is not mediated by some means and so it can't be observable (except maybe with gravity, which is just curvature in space?). Likewise Dark Energy does not mediate with time and is not observable in our current understanding. This is something I am basically throwing out there and is most likely wrong. If there is just a "now", does that mean that everything is at time=0? Does energy stretch throughout space as half-formed connection between matter? Is anything defineable at t=0?
I was thinking as time as an essential distinct, exclusive (time excludes space), element of the Universe; likewise with space. At t=0, is matter just energy? Is it energy that has dimension? I wish I had the time to think, understand, read, enjoy all of this. I wish I could comprehend, or had the time, higher minds than me on this cosmology.