 The ultimate fate of the universe, and implicitly humanity, is hypothesized as one in which biological life will eventually become unsustainable, such as through a Big Freeze, Big Rip, or Big Crunch.Theoretical cosmology studies many alternative speculative models for the origin and fate of the universe beyond the Big Bang theory.A recent trend has been models of the creation of 'baby universes' inside black holes, with our own Big Bang being a white hole on the inside of a black hole in another parent universe.