In Our Time: Wormholes

Melvyn Bragg and guests discuss the tantalising idea that there are shortcuts between distant galaxies, somewhere out there in the Universe. The idea emerged in the context of Einstein's theories and the challenge has been not so much to prove their unlikely existence as to show why they ought to be impossible. The Universe would have to folded back on itself in places, and there would have to be something to make the wormholes and then to keep them open