Hypothetical bridges connecting distant regions of space (and time) could more or less look like garden variety black holes, meaning it's possible these mythical beasts of physics have already been seen.
A typical wormhole's smoking hot lips, it turns out, would be hard to distinguish from the polarized light emitted by the swirling disc of chaos surrounding a black hole.
By that logic, M87* could very well be a wormhole. In fact, wormholes could be lurking at the end of black holes everywhere, and we would have no easy way of knowing.If we were to strike it lucky and stitch together an image of a candidate wormhole as seen indirectly through a decent gravitational lens, subtle properties that distinguish wormholes from black holes just might become apparent.
This would require a conveniently placed mass in between us and the wormhole to distort its light sufficiently to magnify the small differences, of course, but it would at least give us a means of confidently spotting which dark patches of emptiness have a back exit. There is one other means, one that also requires a good dose of fortune. Were we to spot a wormhole at the perfect angle, light traveling across its gaping entrance towards us would have its signature enhanced even further, giving us a clearer indication of a gateway through the stars and beyond.
Further modeling could reveal other characteristics of light waves that help sift wormholes out of the night sky without the need of lensing or perfect angles, a possibility the researchers are now turning their attention to.
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