200 most important Astronomy topics - Sykalo Eugen 2023

The Wormhole Theory

Imagine standing beneath a sky rippling with stars, knowing that, somewhere out there, the very fabric of space might fold over itself like a page in a book... What if you could step across that fold and arrive on the other side of the galaxy in a blink?

It sounds like science fiction. And, to be brutally honest, right now—it is. But the idea that our universe could hold shortcuts through spacetime isn’t just poetic imagination or the domain of wormhole-riddled movies. It is a serious, mathematical consequence of Einstein’s general theory of relativity. The idea is both terrifying and exhilarating. Wormholes, if they exist, might not just be tunnels—they could be the ultimate cosmic rebellion against the tyranny of distance and time.

But let’s start from the beginning. Or, more precisely, from a black hole.

What Are Wormholes, Really?

Wormholes—also called Einstein-Rosen bridges—are theoretical passages through spacetime, connecting distant points in the Universe. Picture the universe as a two-dimensional sheet of paper. Now fold that paper so two points touch, then stab a pencil through them. That pencil? That’s your wormhole. It doesn’t just bend the rules of travel—it punctures them.

Albert Einstein and Nathan Rosen first proposed the concept in 1935, while exploring solutions to the equations of general relativity. At the time, they weren’t thinking of starships or intergalactic travel—they were trying to understand black holes and the strange singularities at their centers. But their work laid the mathematical groundwork for a portal that could, in theory, connect two otherwise distant regions of space—or time.

Let’s not shy away from the term: spacetime. It's the grand fabric of the Universe, weaving together the three dimensions of space and the one of time into a single continuum. Gravity, in Einstein’s view, isn’t a force but a bending of this fabric by mass and energy.

And wormholes? They are the extreme gymnastics spacetime might perform under the right circumstances.

The Science (and Speculation) of the Impossible

Now, before you pack your bags for Alpha Centauri, here’s the catch: no one has ever observed a wormhole. Not directly. Not indirectly. Not even suspiciously. They remain, for now, a ghost in the equations—a solution that the math allows, but the Universe hasn’t yet RSVP'd to.

According to the Schwarzschild solution, wormholes might be created alongside black holes—but they would pinch off too quickly for anything (even light) to pass through. That’s the universe saying: Nice try, dreamer.

But physicists—relentless cosmic poets that they are—didn’t stop there. In 1988, Kip Thorne (yes, the same Kip Thorne who advised on Interstellar) and his colleagues proposed a version of a traversable wormhole. This one could, in theory, stay open if it were threaded with something utterly exotic: negative energy or exotic matter. Not just weird matter, but matter with properties so strange they would repel gravitational collapse instead of succumbing to it.

I know. Negative energy? It sounds like new-age pseudoscience. But it’s a real thing—in quantum theory, at least in tiny amounts. The Casimir effect, observed in laboratories, shows that two uncharged plates placed very close together in a vacuum will attract due to a negative energy density between them. It's subtle. It's small. But it's real.

Could such energy keep a wormhole open? Maybe. We’re not sure. And that uncertainty—that almost, but not yet—is what keeps the dream alive.

What Would It Be Like to Travel Through One?

Here’s the part where science meets storytelling.

Imagine this: You enter a spacecraft parked at one mouth of a wormhole near Earth. You accelerate gently and enter the tunnel. Outside your ship, the universe warps into a tunnel of stars, light twisting in eerie, beautiful patterns. Within minutes—perhaps seconds—you emerge near a star system tens of thousands of light-years away. Or maybe in another galaxy entirely. Or... in the past?

Yes, you read that right. Some solutions of wormholes allow for time travel. If one mouth of the wormhole moves at relativistic speed (close to the speed of light) and returns to its original location, time dilation would mean the two mouths are no longer synchronized. Step into one, and you emerge not just elsewhere, but elsewhen.

This makes physicists nervous. Time paradoxes abound. What if you went back in time and prevented the wormhole from ever being created? The so-called “grandfather paradox” haunts these discussions. Some physicists, like Stephen Hawking, proposed a chronology protection conjecture—an idea that the laws of physics conspire to prevent time travel from ever actually happening, no matter what the equations say.

But... we don’t know. Maybe the Universe is more playful than protective.

Could Nature Already Be Using Wormholes?

Here’s a thought that’s both humbling and a little chilling: What if wormholes already exist—but we simply don’t know how to see them?

Theoretical physicists have suggested that some black holes—especially those that don’t behave as expected—could be camouflaged wormholes. In 2020, a team led by José Luis Blázquez-Salcedo proposed that certain gravitational lensing patterns could help us tell them apart. The Event Horizon Telescope, which famously imaged a black hole in 2019, might someday help us distinguish the two.

Another frontier lies in the fabric of spacetime itself. Some quantum gravity theories suggest that wormholes could be fundamental building blocks of the universe—part of the microscopic “foam” from which space and time emerge. The term spacetime foam, coined by John Wheeler, evokes a wild image: the universe as a seething froth of wormholes at the Planck scale (a trillion trillion times smaller than an atom). It's chaos. It's beauty. It’s science with a sense of mystery intact.

Philosophical Detours: What Wormholes Say About Us

Here’s where things get personal.

Why are we so obsessed with shortcuts? With piercing the veil of distance, defying the limits that nature seems to set? Maybe it's in our DNA—this cosmic restlessness. After all, we’ve crossed oceans, mapped the continents, and sent machines to the edge of the solar system. Wormholes are the final frontier of that impulse.

They represent not just scientific curiosity but something deeper: a longing for connection in a vast and indifferent cosmos.

They also challenge our understanding of causality, of existence, of reality itself. If wormholes allow time travel, what does that mean for free will? If space is not absolute, if distance can be folded, what else about our assumptions is up for reconsideration?

I remember the first time I read Carl Sagan’s Contact. There was a scene where a wormhole is used to travel across galaxies in moments. But more than the science, it was the human reaction that stuck with me: awe, fear, and an overwhelming sense of the sublime. That feeling—that unnameable mix of dread and beauty—is what wormholes evoke. Not just a path through space, but through understanding itself.

The Road Ahead (or: Why You Should Care)

No, we don’t yet know how to build wormholes. We may never. But studying them forces us to confront the deepest truths of the Universe. It sharpens our theories, inspires our technologies, and—most importantly—enriches our imagination.

And who knows? A century ago, black holes were just mathematical ghosts. Now we have photographs of them.

So maybe, just maybe, your great-grandchildren will grow up in a world where a wormhole isn’t science fiction but public infrastructure.

Until then, we look up. We imagine. We calculate. We wonder.

And isn't that, in the end, what makes us human?