Einstein cross is the event where the gravitational lens turns the light around the massive gravitational center. Einstein cross is one of the things that can prove the warping of time and space around supermassive objects. The image shows how massive gravitation changes the route of photons. And that thing can cause an interesting phenomenon.
There is a possibility that the massive gravitational center can make the object that is between gravitational objects and the earth invisible. The gravitational lens is quite similar to the magnetic lens that creates the plasma pulse in Earth's magnetic field. If that focus is between Earth and the galaxy, that acts as a gravitational lens that focuses where plasma and photons can cover weaker galaxies under their shine.
So the difference between gravitational lenses and magnetic lenses is that gravitational lenses are more powerful phenomena. All objects in the universe can act as gravitational lenses. But only galaxy-size objects can curve the photons' trajectories in such a way that we can measure them. Also, the earth's gravitational field can act as a gravitational lens. But the focus of that field is so far away from the Earth that nobody can benefit from it.
"The Einstein cross DESI-253.2534+26.884, as observed using MUSE in May 2023. (Cikota et al., arXiv, 2023) ( (Spectacular New Einstein Cross Discovered Warping Space-Time)
The gravitational lens also bends the trajectories of particles other than photons. So the gravitational lens acts on all known material and wave movements.
The idea is that when light travels through a gravitational lens, it will reach a higher energy level than light outside of that event. A gravitational lens also changes the trajectories of plasma and other particles, like electrons. So if we are looking through the gravitational lens, that thing makes it possible that photons and plasma are forming similar effects as Earth's magnetic field does during so-called plasma pulses. That extremely powerful pulse can hide objects behind it if they are between Earth and the gravitational lens.
When light travels near black holes, it pulls lots of photons inside. But it also curves photons' trajectories. Some of those photons travel to the focus that the gravitational field makes. At that point, photons interact with each other. Also, other particles than just photons travel in that focus. That creates a very high energy point in the universe.
https://www.sciencealert.com/spectacular-new-einstein-cross-discovered-warping-space-time
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