Who coined the term "Big Bang" in cosmology?

Sir Fred Hoyle FRS (24 June 1915 – 20 August 2001) was an English astronomer noted primarily for the theory of stellar nucleosynthesis, but also for his often controversial stances on other scientific matters—in particular his rejection of the "Big Bang" theory and his promotion of panspermia as the origin of life on Earth.

He coined the term "Big Bang" during a 1949 BBC radio broadcast. It is popularly reported that Hoyle, who favored an alternative "steady state" cosmological model, intended this to be pejorative, but Hoyle explicitly denied this and said it was just a striking image meant to highlight the difference between the two models.