Article / Updated 03-26-2016
String theory may offer some answers to what came before and what caused the big bang. In fact, under the big bang theory — formulated in a universe of quantum physics and relativity — the laws of physics result in meaningless infinities at that moment.
According to the big bang theory, if you extrapolate the expanding universe backward in time, the entire known universe would have been compacted down into a singular point of incredibly immense density.