Michio Kaku: Mr Parallel Universe | Education | The Guardian
"String theory predicts the universe is like a soap bubble that is expanding and dying," he says. Billions of years from now stars will blink out; the night sky will be dark and the oceans will freeze over. But we may have an escape route. Our soap bubble co-exists with other soap bubbles; every time a black hole forms it may be creating a baby universe. The matter being sucked in may be blown out the other side, creating a white hole in a twin universe, which will expand very rapidly, like our own Big Bang.
"Perhaps, also, a Type III civilisation, which can harness the Planck energy, will open a hole in space and tunnel through a wormhole to a parallel, warmer universe. There is no other hope. Either leave the universe or die with it. If the wormhole is microscopic in size then we may send a nanobot that can reproduce itself indefinitely and create cloning factories to recreate the dead civilisation through it."