Wormholes are science fiction staples that can send travelers across galaxies without having to worry about 1,000-year trips or cosmic roadblocks. Predicted by general relativity, such objects are still just theoretical—unless you’re a magnet.
A trio of scientists at the Universitat Autònoma de Barcelona has built a device that functions as a kind of wormhole for magnetic fields. If the device is put inside an applied magnetic field, it is magnetically undetectable. And if another magnetic field travels through the wormhole, it appears to leave space altogether, only showing up at either end.
This magnetic wormhole won’t teleport anything to another star system, but it could offer a path to building magnetic resonance imaging (MRI) machines that don’t involve putting patients in a claustrophobic tube.
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