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 World's Last Night and Other Essays Cambridge. In 1958, Hoyle was Plumian professor of astronomy at Cambridge and engaged in the study of the structure and evolution of the stars. Even though he coined the phrase “Big Bang,” Hoyle rejected the ‘big bang’ theory of the origin of the universe in favor of the steady state theory, which claimed that the universe has always looked as it does now. Martin Ryle, however, held to the big bang theory for the creation of the universe in a moment, the theory that eventually held sway. Some of Hoyle’s writings, including science fiction and plays, popularized astronomy. Christopher H.