What are Wormholes? | Will we ever be able to travel through Wormholes?

What are Wormholes? | Wormholes Explained

If you saw a wormhole in reality, it would appear round, spherical, a bit like a black hole. Light from the other side passes through and gives you a window to a faraway place. Once crossed, the other side comes fully into view with your old home now receding into that shimmering spherical window. But are wormholes real, or are they just magic disguised as physics and maths? If they are real, how do they work and where can we find them?

For most of human history, we thought space was pretty simple; a big flat stage where the events of the universe unfold. Even if you take down the set of planets and stars, there's still something left. That empty stage is space and it exists, unchanging and eternal. Einstein's theory of relativity changed that. It says that space and time make up that stage together, and they aren't the same everywhere. The things on the stage can affect the stage itself, stretching and warping it. If the old stage was like unmoving hardwood, Einstein's stage is more like a waterbed. This kind of elastic space can be bent and maybe even torn and patched together, which could make wormholes possible. Let's see what that would look like in 2D. Our universe is like a big flat sheet, bent in just the right way, wormholes could connect two very, very distant spots with a short bridge that you could cross almost instantaneously. Enabling you to travel the universe even faster than the speed of light. So, where can we find a wormhole? Presently, only on paper. General relativity says they might be possible, but that doesn't mean they have to exist. General relativity is a mathematical theory. It's a set of equations that have many possible answers, but not all maths describes reality. But they are theoretically possible and there are different kinds.

1) Einstein Rosen Bridges:
The first kind of wormholes to be theorized were Einstein Rosen Bridges. They describe every black hole as a sort of portal to an infinite parallel universe. Let's try to picture them in 2D again. Empty space time is flat, but curved by objects on it. If we compress that object, space-time gets more curved around it. Eventually, space-time becomes so warped that it has no choice but to collapse into a black hole. A one-way barrier forms: the event horizon, which anything can enter but nothing can escape; trapped forever at the singularity at its core. But maybe there is no singularity here. One possibility is that the other side of the event horizon looks a bit like our universe again but mirrored upside down, where time runs backwards. In our universe things fall into the black hole. In the parallel universe, with backwards time, the mirror black hole is spewing things out a bit like a big bang. This is called a white hole. Unfortunately, Einstein-rosen bridges can't actually be crossed. It takes an infinite amount of time to cross over to the opposite universe and they crimp shut in the middle. If you go into a black hole, you won't become the stuff coming out of the white hole. You'll only become dead. So, to travel the cosmos in the blink of an eye, humans need a different kind of wormhole; a Traversable Wormhole.

2) Very Old String Theory Wormholes:
If string theory or one of its variations is the correct description of our universe, then we could be lucky and our universe might even have a tangled web of countless wormholes already. Shortly after the Big Bang, Quantum fluctuations in the universe at the smallest scales far smaller than an atom may have created many, many traversable wormholes. Threaded through them are strings, called cosmic strings.
In the first billionth of a trillionth of a second after the Big Bang, the ends of these tiny, tiny wormholes were pulled light-years apart; scattering them through the universe. If wormholes were made in the early universe, whether with cosmic strings or some other way, they could be all over; just waiting to be discovered. One might even be closer than we realize. From the outside, black holes and wormholes can look very similar; leading some physicists to suggest the supermassive black holes in the centre of galaxies are actually wormholes. It will be very hard to go all the way to the centre of the Milky Way to find out though, but that's okay. There might be an equally extremely hard way to get our hands on a wormhole, we could try to make one.

3) Manmade Wormholes:
To be traversable and useful, there are a few properties we want a wormhole to have. First, it must obviously connect to distant parts of space-time. Like your bedroom and the bathroom, or Earth and Jupiter. Second, it should not contain any event horizons, which would block two-way travel. Third, it should be sufficiently sized so that the gravitational forces don't kill human travelers. The biggest problem we have to solve, is keeping our wormholes open. No matter how we make wormholes, gravity tries to close them. Gravity wants to pinch it closed and cut the bridge; leaving only black holes at the ends. Whether it's a traversable wormhole with both ends in ours, or a wormhole to another universe,it will try to close unless we have something propping it open. For very old string theory wormholes, that's the cosmic strings job. For man-made wormholes, We need a new ingredient called Exotic Matter . This isn't anything like we find on earth, or even antimatter. It's something totally and different and exciting, with crazy properties like nothing that's ever been seen before. Exotic matter is stuff that has a negative mass. Positive mass like people and planets and everything else in the universe, is attractive because of gravity. But negative mass would be repulsive; it would push you away. This makes a kind of anti-gravity the props open our wormholes. And exotic matter must exert enormous pressure to push space-time open, greater even than the pressure of the centres of neutron stars. With exotic matter, we could weave space-time however we see fit. We may even have a candidate for this exotic matter, the vacuum of space itself. Quantum fluctuations in empty space are constantly creating pairs of particles and antiparticles, only for them to be annihilated an instant later. The vacuum of space is boiling with them, and we can already manipulate them to produce an effect similar to the negative mass we're looking for. We could use this to stabilize our wormholes. Once we're keeping it open, the ends would start together. So, we'd have to move them around to interesting places. We could start by wiring the solar system; leaving one end of each wormhole in orbit around the earth. We could flick others into deep space. The earth could be a wormhole hub for a vast interstellar human civilization spread over light-years, but only a wormhole away.

However, wormholes have a dark side. Even opening a single wormhole, kind-of breaks the universe in fundamental ways, potentially creating time travel paradoxes, and violating the causal structure of the universe. Many scientists think that this not only means they should be impossible to make, but that it's impossible for them to exist at all. So, for now, we only know that wormholes exist in our hearts, and on paper in the form of equations.

Will We Ever Be Able to Travel Through a Wormhole?

What happens when you have two black holes, quantum particles and a hell of a lot of gravity all in one place? Many of you guys might’ve seen this demo of how a wormhole works. So if you have two points on a piece of paper, like two planets in space that you want to travel between really quickly. If you fold space in half, you can get the two points (or planets) to connect. This is the idea of how a wormhole works and possibly time travel. But for that to exist, we’d need huge warping of spacetime, which is really hard for us to do with Einstein’s theories came the idea that if there are two black holes, they could be connected through a wormhole also known as the Einstein-Rosen bridge. The wormhole wouldn’t be traversable because it would be too unstable to remain open. It would require a lot of quantum negative energy to counteract the immense gravity from the black hole, it’s really complicated. Up until now, scientists thought that nothing came out of a black hole, but something known as Hawking radiation has been predicted by Stephen Hawking himself to be emitted from black holes.

A theory brought by Steven Hawking himself. Hawking radiation states that black holes are not eternal that they will slowly emit more and more of their matter till they evaporate out of existence. Except if this Hawking radiation leaves one black hole, it could end up spawning another, which could cause those two black holes to become entangled. Becoming entangled just means that they have a connection, that they share the same quantum particles. It’s like as if the two black holes are related to each other. And THIS is where the fun stuff comes in about possible time travel. Quantum mechanics says that if two black holes are quantum entangled there may be a wormhole that connects them together, if this is true, then any particle that falls into one of the black holes can in theory come out of the other one. So in a way, from this Hawking Radiation, it built sort of a bridge between the two black holes, a possible traversable wormhole. There’s quite a heated debate about this new theory because some believe that nothing escapes a black hole and it’s filled with a forever increasing density while others believe black holes to be totally empty. If a black hole is totally empty then there is no possibility for a bridge, a connection, or a time-traveling traversable wormhole. But that’s just the theories right now and more math is needed to figure it all out. So until the day we can actually observe and experiment with wormholes we’ll just have to keep researching on it. Carl Sagan used the idea of a wormhole as a form of time travel in his 1985 Science Fiction Novel Contact which caused a bit of a debate in the science world.

What If a Wormhole Formed in Our Solar System?

What would happen if a wormhole formed in our Solar System? You've probably heard of wormholes through Thor, Interstellar, Star Trek, or if you're really old school, Albert Einstein. In 1935, Albert Einstein and physicist Nathan Rosen came up with the idea of bridges in space time! Einstein's Rosen Bridge, or a wormhole, is also a shortcut through space time! A wormhole is less like a bridge and more like a tunnel. It's a tunnel that links two different points in space time and if you were to pass through it, you could end up in a different galaxy, a different universe, or 14th century Europe but only if you found a way to keep the wormhole from collapsing on you. The trouble is, no one's ever seen a wormhole before. And we probably won't find one any time soon. The other problem is, if wormholes do exist in our solar system, they're probably microscopic. Any wormhole that could accommodate human travel would require a crazy amount of mass. Think about it, the smallest black hole is thought to be the size of an atom, but with a mass of a mountain. So while we can't really calculate the mass of a wormhole that could fit a few of us and a spaceship, just know that it would be astronomical. And it's gravitational pull would probably re-direct the tilt and rotation of all the planets in our solar system. But things would go back to normal soon enough.

Wormholes are incredibly unstable and are prone to collapse quickly. This is because the walls of a wormhole attract each other, which is why the wormhole would probably close shortly after it opened unless you had some Exotic Matter. And it's what you'd need in order to repel the gravitational forces trying to bring the walls of the wormhole together. Unfortunately, it's unlikely that such matter even exists in our universe. The laws of physics say that You wouldn't be able to put enough energy into a wormhole to keep it from collapsing. But on the bright side, that rule hasn't been tested yet! So, giddy-up space cowboy! Ride on, prove their existence, and we'll try to develop the necessary technology in your absence. But even if we could create wormholes and travel through them, Is it worth tilting the Earth, and rearranging the solar system just to visit another galaxy? Or go back in time? Read your history, read your science fiction, see all the movies and play all the games you want but let's be glad our solar system is the way it is.