Who says it was? We have no evidence whatsoever that there are other universes, or that the universe is somehow cyclic. In fact, it's quite likely that we can never have proof of that, since we'd have to somehow go outside the universe to check. Good luck with that.
Einstein's theory explained the Big Bang. He said 'we are like insects living in a bubble and when the bubble expand, that is call the big bang.' But what happen before the Big Bang? that is when string theory comes in. Strings theory says that there are other universes out there, there is no rule law of physics that says 'multi universes cannot exists'. where the big bang came from? when the two universes collide, it can form another universe, when the universe spit in half, it becomes two universe. That is what physicists think 'that is the big bang.
Secret Rhythm of the Universe was created in 2001.
You Are the Universe was created on 1997-06-14.
The Catalogue of the Universe was created in 1985.
Planets of the Universe was created in 2001.
Pocket Universe was created in 1997.
Blasters of the Universe was created in 1993.
The Ambidextrous Universe was created in 1964.
Tenchi Universe was created in 1995.
The Disappearance of the Universe was created in 2003.
Rock the Universe was created in 1999.
Programming the Universe was created in 2006.
Universe Championships was created in 1948.