How It Began

How It Began: A Time Traveler's Guide to the Universe
AuthorChris Impey
SubjectAstronomy
GenreNon-fiction
PublisherW. W. Norton & Company
Publication date
January 14, 2012 (paperback)
Media typePrint (hardcover and paperback) and electronic
Pages448
ISBN978-0393343861
Preceded byHow It Ends: From You to the Universe 
Followed byDreams of Other Worlds 

How It Began: A Time Traveler's Guide to the Universe is a non-fiction book by the astronomer Chris Impey that discusses the history of the universe, with chapters ranging from the proximate universe to within an iota of the Big Bang. It was published as a hardcover by W. W. Norton & Company in 2012 and as a paperback in 2013. It is actually the prequel to his 2010 book How it Ends: From You to the Universe, which talks about how everything, from individual humans, to the human species, to the Earth, and finally, the universe, might one day end in the future.