While we share the excitement with others regarding recent discovery that the universe is accelerating in its expansion, the dark energy part is rather spooky. There is another model that gives the same results without such energy and we will greatly appreciate experts who can review the model. The author is a simple engineer, not an astrophysicist. He said he has a headache each time he tries to imagine what the dark energy is like http://www.atlanticd...com/science/109 (A Clumping Universe) Thank you.