Question: When does series 11 of big bang theory start?
Disambiguated questions and answers: question: When does series 11 of big bang theory start airing?
When does series 11 of big bang theory start filming?
answer: September 25, 2017
August 15, 2017
Natural Questions answer: September 25 , 2017 (from the Wikipedia article "The Big Bang Theory (season 11)")