the big bang theory, describes how the universe expanded from an initial state of extremely high density and high temperature

andromeda astrology astronomy background bang big black blue bright burst celestial concept constellation cosmic cosmos creation dark deep density describes elements energy expanded exploration explosion extremely fantasy galaxy glow high how initial interstellar largescale light microwave milky nature nebula nebulae night planet power radiation render rendern science scifi sky solar space speed star state structure sun supernova system temperature theory time universe warp