Probably dumb question: I always hear about the universe expanding. And as a proponent of the "big bounce" idea that the universe will expand and then contract in a cycle (as with the other cycles we see in nature) this is disappointing. My question is, being that we perceive time in a linear fashion, and being that space and time are the same thing (space-time) doesn't it simply naturally follow that the perception of the universe expanding is a condition of our experience of time?