Changes

|title=The Book Of Universes

|sort=Book Of Universes

|publisher=Vintage

|date=February 2012

|summary=A readable account of the history of the study of the universe, which is an excellent introduction to the topic. A little hard going at times, but this is more to do with subject matter than the writing itself.

}}

The idea of a 'multiverse' - multiple universes existing alongside each other - is something science fiction and fantasy fans are fairly au fait with. Parallel realities in which you made a different decision at a pivotal moment and, as a consequence, have evolved in entirely different ways, have been fodder for authors, scriptwriters and 'what if' musings for some time, but recently, scientists - specifically cosmologists - have been taking increasingly seriously.