The Space so wide So large the World

Are there really black holes, why do galaxies rotate so fast, is it because of dark matter or have we misunderstood something? Is the theory of the big bang really the only conceivable way to build a universe? What is the space and what the time? Can they be bent and curved, or does this idea lead us into a dead end? Physics today is more unchallenged than ever before. It seems to have sovereign a...