"Wormholes" can be simply explained as cosmic tunnels that can link two distant areas of the universe. Using current available technology it would be impossible to make a gravitational wormhole, as the field would have to be operated with gigantic amounts of gravitational energy, which no-one yet knows how to produce. In electromagnetism, nevertheless, developments in metamaterials and invisibility have permitted scientists to put forward numerous designs to accomplish this. Researchers in the Department of Physics at the Universitat Autònoma de Barcelona have generated the first experimental wormhole that can link two regions of space magnetically. This comprises of a tunnel that transmissions the magnetic field from one point to the other while keeping it untraceable - unobserved - all the way.
This sphere is made in a particular way so that it is magnetically untraceable, invisible, in magnetic field terms, from the outside. The research was published in Scientific Reports.