[hosepipe]

Wonder why the Universe don't fill up like a glass with frequencies of waves of light.. Light has been bouncing off of everything for a really long period of time.. Light don't disappear like electricity..

[Alamo-Girl]

Well, if space/time pre-existed then it would tend to "fill up." But it doesn't pre-exist. Space/time is created as the universe expands.

There are two worldviews though. One believes that space/time expansion is the effect of energy/matter. The other believes and energy/matter is the effect of the expansion of space/time.

I'm of the latter worldview.