The moment of creation for the universe.The study of the Big Bang and the subsequent evolution of the universe is a known as cosmology. The best method for determining the age of the universe is by using the Hubble law. Current estimates give 12-20 billion years. The phrase "Big Bang" was coined by Fred Hoyle in an interview on BBC radio. He used the term in a derogatory sense (since the steady-stead model, of which he was a proponent, was the accepted one at the time), but it stuck at has entered the standard vernacular.