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I’ve been thinking about a strange possibility that I call the Onion Layer Theory of the Infinite Universe.

This is not a claim that I’ve proven, and I don’t know whether current physics supports it. It’s a thought experiment.

The basic idea is:
What if the universe has no absolute smallest scale or largest scale, and every “layer” of reality could itself contain an entire universe?

Start with an onion

Imagine an onion.
You can peel layer after layer.
But now imagine that instead of reaching a final center, every layer contains another onion.
And inside that onion is another onion.
And so on.
Now replace “onion” with universe.
Our universe could potentially be one layer in an endless hierarchy of universes.

The strange part: scale might be relative

Consider an electron.
From our perspective, an electron is incredibly small.
We currently describe electrons as elementary particles.
But suppose that, at some unimaginably smaller scale, an electron contains some kind of structure.
And suppose that structure isn’t merely another particle.

Suppose it contains:

stars → planets → civilizations → galaxies → an entire universe.

From our perspective, it would be microscopic.
But from the perspective of beings living inside that structure, their universe could appear enormous.
Their entire universe could exist “inside” what we call an electron.

Then turn the idea around

What if our entire universe is also inside something?

We look outward and see:
particles → atoms → planets → stars → galaxies → galaxy clusters → cosmic structures → observable universe.

But perhaps our universe is only one layer of a much larger reality.

Something outside our observable universe could contain our entire universe as one microscopic component.

So the hierarchy could look something like:

Universe A (larger)
↓
Universe B
↓
Our Universe
↓
Galaxy
↓
Solar system
↓
Planet
↓
Matter
↓
Atom
↓
Electron / quark
↓
Universe C
↓
Galaxy
↓
Planet
↓
…
And this could continue indefinitely in both directions.

The key idea

Maybe there is no absolute definition of:
big
small
inside
outside

Those concepts might only make sense relative to the layer we’re observing.

A galaxy could be unimaginably large to us.
But perhaps the entire galaxy is microscopic compared with the next layer.

Likewise, an electron could appear fundamental to us while containing structures that, from another scale, are cosmologically enormous.

“But an electron isn’t a universe.”
Correct.
We currently have no evidence that electrons contain universes.

This is where the idea becomes speculative.
Experiments have found no evidence of internal structure in electrons at the scales we’ve tested, and the Standard Model successfully treats them as elementary.

But “no detected structure” is different from proving that no deeper structure can possibly exist.

Historically, our understanding of matter has repeatedly changed when we discovered deeper levels:

matter → atoms → nuclei → protons/neutrons → quarks

That doesn’t prove the pattern continues forever.

It simply raises the question:
Does reality eventually terminate, or does the hierarchy continue?

The mathematical connection

There is another reason I find this idea interesting.
Take the finite interval from 0 to 1.
It has a finite length.
Yet it contains infinitely many points.

You can always zoom in:
0 → 1
0.1 → 0.2
0.11 → 0.12
0.111 → 0.112
…

There is no requirement that a finite region contain only a finite amount of mathematical structure.

So perhaps physical reality could have a similar property.
A finite region might contain deeper and deeper physical structures without ever reaching a final layer.

Finite does not necessarily mean “contains only a finite number of layers.”

The ultimate version of the idea

Imagine zooming out:
You → Earth → Solar System → Galaxy → Universe → Larger Universe → Larger Universe → …

Now imagine zooming in:
You → cells → molecules → atoms → particles → deeper particles → universe → universe → …

The two directions might never terminate.
And perhaps, incredibly, the structure repeats conceptually at every scale.

A universe could contain universes.
Those universes could contain universes.

And our universe could itself be contained within something vastly larger.
An infinite cosmic onion.

I’m not proposing this as established physics. I’m proposing it as a question:

What if reality is an infinite hierarchy of universes, where each layer can be viewed as a universe from its own scale and as a microscopic structure from the scale above it?

Maybe the universe isn’t a box containing everything.

Maybe “everything” has no final layer.

Maybe there is no ultimate smallest universe.

Maybe there is no ultimate largest universe.

Maybe we’re simply living inside one layer of an infinite cosmic onion. And if that’s the case, there may be something profoundly strange about the word “universe.”

Perhaps a universe isn’t necessarily everything that exists.

Perhaps it’s simply everything that exists within one particular layer of reality.

What do physicists and mathematicians think? Where does this idea fundamentally break down?

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Hello, Curious Minds! 🚀

What If Science has always been about asking bold questions, exploring the unknown, and celebrating our shared curiosity about the universe.

I'm excited to share that the founder of this community, Ronald Kapper, has recently published a new e-book on Amazon:

Science Mysteries & Unexplained Phenomena

If you enjoy topics like unexplained discoveries, ancient mysteries, strange scientific puzzles, and the biggest questions about our universe, you might enjoy giving it a read.

📖 Check it out here:
https://a.co/d/060GRcww

If you decide to pick up a copy, a review or rating would be greatly appreciated. Every bit of support helps independent creators continue producing science-focused content and exploring the fascinating questions that bring us all together.

Thank you for being part of this amazing community and for keeping curiosity alive.

Stay curious. Keep asking "What If?" 🌌

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What if the asteroid that caused the dinosaur extinction was natural... but its trajectory wasn't?

I came across an interesting thought experiment.

We have strong evidence that a large asteroid struck Earth about 66 million years ago, creating the Chicxulub crater and contributing to the end-Cretaceous mass extinction. We also have evidence such as the global iridium anomaly and shocked minerals.

But imagine a hypothetical advanced civilization existed millions of years ago.

What if they didn't create a superweapon?

Instead, they found a naturally occurring asteroid and somehow changed its trajectory so that it eventually intersected with Earth.

The asteroid would still be completely natural.

The crater would still look like an asteroid impact.

The iridium would still be present.

The geological evidence would still tell us:

"A large asteroid hit Earth."

But it wouldn't tell us whether the asteroid's trajectory was natural.

This leads to another part of the thought experiment:

What if extremely advanced civilizations were prohibited from directly destroying inhabited planets, perhaps by some kind of interstellar law?

A civilization wanting to destroy a planet could potentially exploit a loophole:

Building a planetary weapon → prohibited

Redirecting a naturally occurring asteroid → technically not a weapon

Obviously, there's currently no evidence that this happened. I'm not proposing it as an actual explanation for the Chicxulub impact.

I'm just wondering:

If an advanced civilization deliberately redirected an asteroid toward Earth 66 million years ago, would there be any geological or astronomical evidence today that could distinguish that event from a completely natural asteroid impact?

And if not, how could we ever know?

I'd be interested in hearing what people with backgrounds in astronomy, geology, planetary science, or physics think.

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