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Your question has been asked for centuries without a good answer. Here is how I came to understand this.

First, imagine the universe expansion as a sphere moving out of a single point, the Big Bang. We are somewhere on that sphere and we see all the other galaxies by transparency. But then, why isn't half of the sky dark in the "outward" direction? I couldn't understand it.

Years later, I read about space-time. What we see in the sky is not what is now. Light from distant galaxies show where they were billions of years ago!

Okay, being an illustrator by profession, I tried to draw that: from the sphere of where we are, the more distant another object is, the more inside the sphere it is, because that's where it was when its light left it on its journey toward us.

But ... that still doesn't explain why one hemisphere of the sky is not dark because ... obviously, that is "outside" and therefore ... the future, right?

Then, one day, I thought: Hum, when I look at the sky, in any direction, the farther an object is, the older it is ... in any direction! Soooo, at the "end" of the sky, I must see ... the "beginning," the Big Bang!

But I don't see the Big Bang, I only see black space!

Then I read further and ... yes, we can see the Big Bang! And in all directions! Okay, it's not visible as light because it has spread and got colder with time. We see it now as a microwave frequency. It is called the Cosmic Microwave Background radiation! It is the "noise" that makes white dots on your TV screen if you are connected to an antenna without any channel tuned in.

So, with my two first drawings, I was wrong because I was mixing time as a space dimension. The real vision of the universe cannot be drawn. But it looks like this: Wherever we are in the universe, we see it as if we are at its center (all galaxies move away from us!) And when we look outside, in any direction, we see ... its center!

Isn't it amazing? That's how we must see the universe and when you do, you'll understand why "the end of the universe" is a question that cannot be asked.

As you have already been told, you must think of it as if you were a fish swimming in the ocean of a planet without continents. You are always in the middle of it!

Yes it dose end then starts over again before there was a big bang theory their was our small independent stellar space and planet exploration team. Far out their is a wall of fire it must have been installed by intelligent life we I heard one in his science lango.

The big bang came from a nuclear explosion that we in the universe live in this ball of fire and one can not see until you come up close to it and it is sphere.

Just like a wall around a castle or mote there is this nuclear energy to keep out siders out.

So we Consul in other physicist and found a way to cross. It was ugly and horrid alien horbut life.

Some have made it into this galaxy or Universe billions of them but not like the trillions on the other side.

NO ONE has ever been to the "end of space". How could we -- we have not been any farther than the moon!

So no one can "prove" that space has an end, or that it it doesn't end. Scientists argue both ways, and based on what we know, BOTH arguments could be correct.

But there is no way to tell at this time.

The farthest we've been able to see into space has been around 14 billion light years.

That distance is what's referred to as "The Visible Universe"

We don't have the technology..yet...to see beyond that.

Someday...we will..I'm sure of that.

Does the surface of the Earth ever end?

It is believed that space is curved and folds back on itself. So, like the surface of the Earth space never ends BUT is finite

No one knows. But can you imagine anything possible being infinite. I don't know anything that's infinite.

nope it doesnt end it goes on for infinite .....

maybe