Since we understand that there are several dozen models for the universe, we must conclude that it isn't an easy process to construct a cosmological model from our observations. Is it comparative to ten people observing an accident? Do we not often get ten different renditions of what happened? How much more difficult is it for ten scientists to look into the cosmos and tell us what happened after the fact.

The Big Bang is the popularized version of evolutionary cosmology. It states that matter, energy, and space were all compressed many billions of times smaller than a proton and then exploded for some undetermined reason to create an expanding universe which continues to spread today.