Cosmogony (or cosmogeny) is any scientific theory concerning the coming into existence, or origin, of the cosmos oruniverse, or about how what sentient beings perceive as “reality” came to be. The word comes from the Greekκοσμογονία or κοσμογενία (from κόσμος - “cosmos”, “the world”) and the root of γί(γ)νομαι / γέγονα (“to be born, come about”).
The Big Bang theory is the prevailing cosmological model of the early development of the universe. The most commonly held view is that the universe was once a gravitational singularity, which expanded extremely rapidly from its hot and dense state. While this expansion is well-modeled by the Big Bang theory, the origins of the singularity remains one of the unsolved problems in physics.
The elegant Universe: String’s the thing
The Elegant Universe: Welcome to the 11th Dimension