Is it known (or can it even be measured) if the universe expansion acceleration rate is increasing or decreasing? I understand that even if known, it would reflect a distant past condition.
This comment/question does not directly relate to the current topic. Someone I was talking to mentioned that 95% of the matter in the universe is unaccounted for. If this was the leading matter that was expelled in the big bang, it could explain why the universe is expanding at an accelerating...