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 Lorre and Molaro, with Prady expected to be involved in some capacity, and intended to air in the 2017–18 season alongside "The Big Bang Theory". The initial idea for the series came from Parsons, who passed it along to "The Big Bang Theory" producers. In early March 2017, Iain Armitage was cast as the younger Sheldon, as well as Zoe Perry as his mother, Mary Cooper. Perry is the real-life daughter of Laurie Metcalf, who portrays Mary Cooper on "The Big Bang Theory". On March 13, 2017, CBS ordered the spin-off "Young Sheldon" series. Jon Favreau directed and executive produced