The Big Bang is the name of the most respected theory of the creation of the universe.  Basically, the theory says that the universe was once smaller and denser and has been expending for eons.  One common misconception is that the Big Bang theory says something about the instant that set the expansion into motion, however this isn’t true.  In this video, Fermilab’s Dr. Don Lincoln tells about the Big Bang theory and sketches some speculative ideas about what caused the universe to come into existence.

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