The expansion comes from red shift measurements compared to distances. The accelerating expansion comes from supernova observations and curve fitting. General relativity is the background theory to explain things, but it is a general theory into which specific observations need to be applied. But between the supernovae, the red shifts, the background radiation, etc, the evidence shows that not only is there an expansion, but that the rate of expansion has been increasing for the last couple of billion years.<quoted text>
you seem like the leader of the class, the one with some smarts. tell me what observable evidence you have or any evidence that shows the universe is not only expanding but also is the expansion is accelerating? other than "the theory of general relativity which predicts that the whole universe is either expanding or contracting, there really isn't any other alternative"
Quite a lot has been done in cosmology recently. Questions that were wide open 20 years ago with factors of two (like the age of the universe) and now known to within 1%. The cosmological constant has been confirmed (again because of the acceleration) and the dichotomies that existed in theories without it have been expanded a bit.