Space tunnels, will they really bring us into other galaxies? It is possible but extremely unlikely that one day we could cross a ‘wormhole’ and come to a new galaxy. It really takes so much energy to create a space tunnel. Science fiction lovers have some familiarity with space tunnels, extraordinary corridors to reach easily in hideous corners of the universe. Thanks to the work of Albert Einstein, the wormholes came out of the bunch of fantasy science ideas to land in theoretical physics books.

According to Einstein’s General Relativity theory, space-time tissue can be deformed and distorted by gravity, so as to allow the formation of a space-time tunnel. This is a real shortcut between two points in space-time, which would allow you to travel between them faster than you would use light to travel through normal space. Imagine two dots drawn on a sheet of paper. The smaller distance between two points on the two-dimensional plane is represented by the segment joining them. But if you fold the sheet so as to approach the two points in the ‘third dimension’, a wormhole would be the hypothetical new segment joining the two points in the plane space. Wormholes have never been observed in our universe, but some researchers think that, given the right circumstances, they can safely work. The problem is that to bend space-time up to forming a wormhole requires a huge amount of energy, such as that of black holes. If the entrance of a space tunnel was only within the horizon of the events of a black hole, then there would be no way to cross it. In order to cross a space tunnel, two problems need to be solved. First, the entry of the space tunnel should be outside the horizon of events, so it will not be crushed by immense gravitational forces. Then, the tunnel should be pretty stable not to collapse on itself when you are passing through it. To solve these two problems we would need what is called ‘exotic matter’, a theoretical substance that would have a negative energy density. “Negative mass matter deforms space-time in a unique way, inflating the entry of the space tunnel outside the horizon of events and stabilizing the interior of the wormhole”.

Although mathematical calculations make it plausible to existence, this exotic substance has never been observed by the researchers. There are too many factors that hinder the possibility of using wormholes: they would violate so many aspects of very well-tested classical physics, which is perhaps better to work on other issues. I know that many people will accuse me of not being creative enough, but the universe does not care about our creativity. The tools of science are hard but loyal judges; If an idea does not work, it just does not work. There are many different and beautiful mysteries in our universe that we certainly still have to understand. But the wormholes are probably not part of them.

Space tunnels, will they really bring us into other galaxies?