Wormholes which might be surrounded by matter, just like the ring that gathers round a black gap, might create unusual rotating clouds of sizzling plasma. Something that falls in a single finish might shoot out the opposite at 200 million kilometres per hour, and even quicker if the wormhole is big.

A wormhole is a tunnel between two places in space-time. The only variations of those hypothetical objects have black holes as “mouths” on both finish of the throat connecting them – nothing can escape as soon as it has…