Hypothetical bridges connecting distant regions of space could look a lot like black holes.
There is a way to tell them apart if a new model proposed by a small team of physicists is correct.
It's possible to show how the spacetime background of the Universe can form not only deep gravitational pits where nothing escapes, but also impossible mountain peaks.
These glowing hills would not allow anything that drew near to belch out particles and radiation that had no hope of being turned back.
There is a chance that the Big bang looks like a white hole, but nothing like it has ever been seen. They are still an interesting concept for exploring the edges of a great theory.
There was nothing to say that a black hole couldn't connect to a white hole to form a bridge.
Our expectations on distance and time go out the window in this corner of physics.
It could be possible for matter to come out the other end with its information intact.
To figure out what a black hole with a butthole might look like to an observatory like the event horizon telescope, a simplified model of a wormhole's 'throat' as a magnetized ring of fluid was created.
Particles caught up in the maelstrom would produce powerful electromagnetic fields that would roll and snap in predictable patterns, polarizing any light emitted by the heated material. The first stunning images of M87* and Sagittarius A* were given by the tracing of radio waves.
A typical wormhole's smoking hot lips would be hard to distinguish from the light coming from a black hole.
It's possible that M87* could be a hole. We don't have an easy way of knowing if there is a wormhole at the end of a black hole.
That doesn't mean there isn't a way to know.
It's possible that subtle properties that distinguish black holes from wormholes will become apparent if we were to stitch together an image of a candidate wormhole.
It would require a mass in between us and the wormhole to distort its light so that we could see which dark patches of emptiness have a back exit.
One of the means requires a good amount of fortune. Light traveling across the gaping entrance towards us would have its signature enhanced even further, giving us a clearer indication of a gateway through the stars and beyond.
The researchers are now looking into the possibility that other characteristics of light waves can be found without the need for lensing or perfect angles.
The physics that describes the behavior of waves and particles could be explored if further constraints on the physics of wormholes were put in place.
Lessons learned from predictions such as these could reveal where general relativity breaks down, opening a few holes of its own and giving us a whole new way of seeing the universe.
The research was published in a journal.