Physicists have worked out a way that it might be feasible to send someone through a wormhole. Wormholes are tunnels between two black holes that connect distant regions of space-time, and normally it would be impossible to pass something through them, but factoring in an extra dimension might make it possible.

Under Albert Einstein’s theory of general relativity, which describes the behaviour of gravity and space-time, most wormholes would either close whenever something falls in or be extremely small and disappear immediately.

Juan Maldacena at …