Watch Astronomy The Sky Isn't Falling - Show Me Science

The sky, in fact the whole universe, is expanding, perhaps the result of the Big Bang, an event many cosmologists think took place about 15 billion years ago. The Big Bang Theory, which is the most widely accepted scientific explanation about the origin of the Universe, is a very complex subject. This program looks at the universe and explains the Big Bang theory in a way that is understandable to students.