A Wall? Then What’s Behind the Wall?

Jun 04, 2025 | Space Universe Curiosity Physics

By: A Curious Mind with a Dream

“What if I build a rocket, leave Earth, and just keep going… forever?”

That’s what I asked myself one quiet night, staring at the stars from my rooftop.
I’m not a scientist (or maybe I am, in my own way), but I know some physics, a bit of engineering, and enough math to imagine how things might work. So I began my mental journey — away from Earth, through the solar system, beyond the stars… chasing the edge of space.

But then I hit a strange question:

What if space has a wall? What’s behind it?

Let’s say I’ve built the perfect ship.
Infinite fuel. No aging. I fly straight, never turning back.

First, I leave the planets behind.
Then stars become dots. Eventually, even galaxies are tiny specks.

The universe becomes a cold, silent ocean of darkness. But I keep going.

So… does it ever end?

Here’s what I learned from my curiosity and a lot of YouTube rabbit holes:

The observable universe is just the part we can see. It’s like a flashlight beam in the dark — there’s probably more beyond it.
Space might be infinite. Like numbers — you can keep counting forever, and there’s no “last” number.
Or, space might loop. Like a video game map that teleports you to the other side when you cross the edge.

So maybe I’ll never hit a wall.
Maybe space has no edge at all.

But still… what if it did?

Let’s play pretend.

I hit the end of space. A giant wall. Solid. Cold. Impossibly vast.

What do I see?

A barrier?
A mirror?
Static? Light? Nothing?

And the real question hits me:

If there’s a wall… what’s behind it?

Another space? A higher dimension? Or maybe — the back side of a simulation?

This is where my engineering mind struggles.
Because “wall” means there’s something beyond it.
And that “beyond” needs space to exist in.

But if space is everything, then there’s no “outside.”
Just like there’s nothing north of the North Pole — not cold or blackness — just a limit to the concept.

Mind. Blown.

I close my eyes. Floating at the edge of this imaginary universe.

No engines. No noise. Just a question:

“What if space doesn’t need an edge?”
“What if the real wall… is in our imagination?”

And suddenly, I’m not scared of infinity anymore.
I’m in awe of it.

Because maybe another curious kid — sitting under the stars — is asking the same thing.
And maybe that kid will be the one to find the answer.

Or better yet…

Build the ship and go see for themselves.

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