Earlier this year, a paper appeared in the journal Physical Review D, entitled “First observational tests of eternal inflation: Analysis methods and WMAP 7-year results” describing analysis of 7 year long survey of the Cosmic Microwave Background — which is the afterglow of the big bang — that attempted to identify signatures of a picture of the universe known as “the eternal inflation model” and to try and test the so-called “bubble-collision hypothesis”.
According to the BBCs reporting of the paper, this theory suggests that we live in a bubble. That our Universe is a bubble. One of many, many bubbles constantly popping into existence. And even colliding. In an ever expanding Universe.
Do you follow? No, neither did we.