Big Bang is a past horizon, though in practice our view is also limited by the opacity of the universe at early times. So our view cannot extend further backward in time, though the horizon recedes in space. If the expansion of the universe continues to accelerate, there is a future horizon as well. English astronomer Fred Hoyle is credited with coining the term "Big Bang" during a 1949 BBC radio broadcast, saying: "These theories were based on the hypothesis that all the matter in the universe was created in one big bang at a particular time in the remote past." It
The Big Bang Theory quietly in Canada, but managed to garner major success in later seasons. "The Big Bang Theory" is telecast throughout Canada via the CTV Television Network in simultaneous substitution with cross-border CBS affiliates. Now immensely popular in Canada, "The Big Bang Theory" is also rerun daily on the Canadian cable channel The Comedy Network. The season 4 premiere garnered an estimated 3.1 million viewers across Canada. This is the largest audience for a sitcom since the series finale of "Friends" (12.4 million viewers). "The Big Bang Theory" has pulled ahead and has now become the most-watched entertainment television show in Canada.