What Came Before the Big Bang?

Cosmologist Alexander Vilenkin has convincing evidence that we are surrounded by expanding, bubble-like universes.

It is cosmology’s most fundamental question: How did the universe begin? The question presupposes that the universe had an actual starting point, but one might just as well assume the universe always was and always will be. In that case, there would be no beginning whatsoever — just an ever-evolving story of which we’re catching a mere glimpse. [Read more] ...