Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The question of how the universe began has always been among the great mysteries. Today, though still quite far from having a complete answer, scientists have pieced together the most comprehensive model of the birth of the universe - the Big Bang theory. But once the notion that the universe had a beginning became accepted by the majority of scientists, its ultimate fate has become a valid and equally interesting cosmological question. Learn more about the most popular theories of what awaits our universe in this book.