This question has been bothering me ever since I started to study the cosmos..... If you believe in the big bang theory - where did the dust cloud come from?? Well, if you don't here's another one..... If you have any other theories relating to the origin of the universe.... where did its constituent elements come from?? If your answer was, "it existed all along". Well, if something has to be existing it had to be created at some point of time and the laws of physics, as far as I know, state that matter can neither be created nor be destroyed... where did the constituent elements come from??