I have a simple question regarding the acceleration of the universe. My textbook says that the acceleration was discovered through the supernova's light appearing dimmer than expected. In a constant expanding universe, it would be brighter. My textbook also tells me that the supernova was extremely far away, and so I'm wondering that shouldn't because it being so far away that it should be expected that it's very dim? The stretching that's occurring due to the distance would have the same affect, would it not?