It is always a mystery about how the universe began, whether if and when it will end. Astronomers construct hypotheses called cosmological models that try to find the answer. There are two types of models: Big Bang and Steady State. However, through many observational evidences, the Big Bang theory can best explain the creation of the universe. The Big Bang model postulates that about 15 to 20 billion years ago, the universe violently exploded into being, in …showed first 75 words of 1281 total…

…showed last 75 words of 1281 total…Cosmology, The Search For The Order Of The Universe. USA: Tab Books Inc., 1986. Gribbin, John. In Search Of The Big Bang. New York: Bantam Books, 1986. Holt, Terry. The Universe Next Door. New York: Charles Scribner's Sons, 1985. Kaufmann, J. William III. Astronomy: The Structure Of The Universe. New York: Macmillan Publishing Co., Inc., 1977. Mache, L. Dinah. Astronomy. New York: John Wiley & Sons, Inc., 1987. Silk, Joseph. The Big Bang. New York: W.H. Freeman and Company, 1989. ------------------------------------------------------------------------------