How long ago did the big bang theory occur? i need help with a project on the big bang theory ( not the show or movie) and i needto find out how long ago did it occur.How long ago did the big bang theory occur? i need help with a project on the big bang theory ( not the show or movie) and i needto find out how long ago did it occur. 2 following 9 answers 9 Report Abuse Are you sure you want to delete this answer? Yes No