Time Travel Through Wormholes – Nothing More than a Dream?

Physicists nowadays admit that time travel through wormholes is at least theoretically possible, although journeys into the past or future have remained firmly in the realm of science fiction. Wormholes, if they exist, would offer a kind of shortcut between places that are distant from each other in space-time. Theory says that they can arise as a connective channel between incredibly massive objects – like black holes, for example. This sort of wormhole, however, would collapse so quickly under its own gravity that not even a light wave would be able cross it before it blinked out of existence. How would you theoretically go about keeping a wormhole open? Seventy years after Einstein first postulated bridges across time, physicists are trying to answer questions like these.