Encage the cloaking devicel Fire up the warp drivel Wait, how come the enemy can see us? It turns out that invisibility cloaks stop working when travelling near light speed, and even lower velocities can give you away. Researchers have been working on invisibility cloaks for a while now. The devices draw on a theory called transformation optics, which enables the design of materials that can bend light around them, hiding anything inside from view. While full-blown cloaks don't exist yet there has been some progress in making cloaks that hide small objects at certain frequencies of light. Although a cloak looks like a patch of empty space, Jad Halimeh at the Ludwig Maximilian University of Munich in Germany wondered if there was a way to distinguish between the cloak and nothingness.
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