Part of the show Stars, Cosmology and the Beginning of the Universe
Bob, via email asked:
From a scientific rather than a religious point of view, why should there be a universe? Why isn't there just nothing?
Well it's thought that most of the matter we have in the universe today did come from nothing. By nothing, I mean the vacuum. There is a favoured mechanism for creating the matter that fills our universe, and this is the convergence of the energy density of the vacuum. In simple terms, one would think of this as nothing, or no material, into matter. So in many ways, everything we see did come from nothing. The way energy density is converted into matter is quite complicated, but it's thought that that's how it occurred, through inflation.