That’s a good question … but where do black holes go?

According to Albert Einstein’s general theory of relativity, black holes are certainly among the most powerful, but also most mysterious objects in the universe. Although their existence is no longer controversial, we must admit today that we know very little about them.

We don’t know what’s inside these cosmic monsters. Several theories have emerged that offer answers that may be helpful for us to better understand reality, particularly to answer the question, “Where do we go when we step into a black hole?” “”

A phenomenal density

As a reminder, there are two types of black holes: stellar black holes and supermassive black holes. The implosion of a star creates stellar black holes, while supermassive black holes are mainly located in the center of galaxies. We know that the mass and radius of such an object, regardless of its nature, are proportional.

In other words, the density of a black hole is inversely proportional to its mass. Therefore, star-type black holes are denser than supermassive black holes. This density is expressed in terms of the gravitational pull at the edge of the event horizon.

Spaghetti, a real danger

Given the point of no return, the event horizon is a particularly dangerous area because once you’ve crossed it, no matter how fast you travel, you can never return. Worse still, anything trying to get there is at risk of an instant noodle effect – that is, it will be spaghetted or stretched by the gravitational tidal forces of the black hole.

Now we come to the big question: what will happen when we cross the event horizon? The answer is we don’t know yet. One theory, however, is that black holes form wormholes.

Wormhole or white hole?

Wormholes are described as tunnels between two different parts of space. Such an idea first emerged in the 1930s. In 1935, Einstein worked with Nathan Rosen to theorize bridges that would connect two different points in space-time and allow entry into other universes. But in his book “The Science of Interstellar”, the physicist Kip Thorne wrote: “We do not see any object in our universe that could become a wormhole with age.” Thorne believes these theoretical bridges will most likely remain science fiction.

Wormhole or white hole? Photo credit: Shutterstock / vchal

Another theory is that black holes are related to white holes that existed in the past. A white hole would allow light and matter to move on a single path: that of the exit. In other words, these elements cannot fit in.

In an article published in Physical Review D in 2014, physicists Carlo Rovelli and Hal M. Haggard mentioned the possible existence of a “classical metric that satisfies Einstein’s equations outside of a finite space-time region, in matter in a black hole collapses and then. ” emerges from a white hole ”. However, this is just a simple hypothesis like so many others. In short, no one knows what is in black holes, let alone where they lead. Perhaps one day, with time and advances in technology in space exploration, we will be able to solve these puzzles.