Hyper nova is the nova destruction of a hyper giant type star. Kinda but no: There are 4 dimensions within our own universe: The obvious 3 dimensional realm we live in, and time is the 4th dimension. The other 6+ out of possible 10-13 exist outside our universe. And parallel dimensions/ universes mentioned in string theory also have the 10-13 dimensions in each of their universes. Idk on the cause of the big bang as explained by string theory but; On the initial expansion of the universe the exact moments after the big bang; its been calculated to be several hundred thousand to hundred TRILLION times the speed of light for at least the first few minutes to the first few hours. (Idk exacts but it expanded super ridiculously faster than the speed of light due to the concentration of energy in such a small space for a good while).