A 2014 BBC Horizon episode which explores the most dangerous idea in science, the possibility that our universe may not be the only universe and that there could be an infinite number which make up a multiverse. The series looks at new research by cosmologists which some claim is evidence that our universe is subject to the gravitational pull of other universes.
Specifically, the distribution of radiation from the big bang 13.8 billion years ago which should be evenly distributed but appears to have a higher concentration in the south part of the sky and a strange ‘cold spot’ which scientists cannot explain. In 2005 Richard Holman, a professor at Carnegie Mellon University, and the theologist Laura Mersini-Houghton were the first to assert the multiverse theory relating to radiation anomalies.
For more on the subject consider purchasing the book Parallel Worlds: The Science of Alternative Universes and Our Future in the Cosmos, written by leading theoretical physicist Michio Kaku and available to purchase in hardback, paperback or audiobook editions.