According to the laws of physics, once you enter the wormhole, you will never be able to leave. A theoretical traveler could paradoxically pass through the middle of the wormhole without actually reaching the second end. That’s because the wormholes are hidden behind so-called event horizons. They are like one-way barriers in space. Wormholes are also very unstable and close before even a glimmer of light can escape.

However, scientists found a theoretical chance to keep wormholes open. It involves using something called exotic matter to build them. It would prevent a wormhole from closing. It’s a form of matter that has negative energy or negative mass. For example, if you had 10 pounds of exotic matter, it would mean you have something with a mass of −10 pounds.

But there’s a small problem: people have never faced something which has a negative mass. On the other hand, we have found matter in the universe with negative energy. Unfortunately, it’s so rare that it’s not possible to make exotic matter for even one wormhole with it.

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