There may have been more than one Big Bang. There may have been an infinite number, each creating it's own unique Universe. So says Alan Guth in his theory 'An Eternity of Bubbles'which can be found on Stephen Hawking's Home Page. Stephen Hawking is possibly the world's foremost theoretical physicist. His field of study involves general relativity and the singularities (Black Holes). Hawking, who is disabled in a wheelchair with A.L.S. (amyotrophic lateral sclerosis, or Lou Gehrig’s  Disease), is able only to communicate by use of a computer. Visit  the  Web Site Hawking maintains along with PBS; < Stephen Hawking's Universe > and explore the theories of modern science. Learn about Space Time and  The Big Bang. Look into the question of Multiple Dimensions or Time Travel. Check our some other links that might be of interest; < Jet Propulsion Laboratory > and < Muller's AstroGeophysics >.
These sites provide links, images and some fascinating theories.