The big bang theory needed improvement.  It left some questions to be answered, and some observations to be explained.  In particular, it was unable to explain what happened before the big bang.Now, one could argue that because space and time were created during the instant of the big bang, there is no such concept as a period of time or space BEFORE the big bang.   Therefore nothing existed before the big bang.  On inspection, this would seem to be a cop-out answer.  Surely something caused the big bang to occur.  Was it a divine creator?  The last 20 years have seen an increasing interest in cosmology and in theories related to the creation of the universe.  Outlined below are some of the major theories that have surfaced in the scientific community, describing the creation of the universe, and/or describing what happened before the big bang.  Perhaps God had many choices when creating the universe.