What does the Church say about the Big Bang Theory?

Did you know one of the leading authors of the idea that the universe began with a gigantic explosion was Cosmologist and Jesuit priest Fr. George Lemaitre?  The 'Big Bang Theory' will be celebrated at the Vatican Observatory this May 9-12, with a guest list of some of the world's leading scientists and cosmologists to talk black holes, gravitational waves and space-time singularities.  I think even Leonard and Sheldon would be impressed.