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 Whole Shebang: A State-of-the-Universe(s) Report Ferris then shows, in a third possibility, that the universe is hanging in the balance in a "critical density" that says Ω looks to be "exactly" 1. Ferris makes the summation the universe will then always expand, but at a slower and slower rate that never completely comes to a halt. He follows this up with some exceptions that Ω is not always observed as "exactly" 1 by all cosmologists. Ferris believes that the Big Bang theory is correct because of microwave background radiation which gives space a temperature of 3 kelvins. The Hubble telescope has also shown, through the