The observable universe is just a fraction of the vast cosmos, ... we delve into five intriguing scientific theories that attempt to explain what exists outside the observable universe.

Astronomers think space outside of the observable universe might be an infinite expanse of what we see in the cosmos around us, distributed pretty much the same as it is in the observable universe ...

The universe, being all there is, is infinitely big and has no edge, so there's no outside to even talk about. Oh, sure, there's an outside to our observable patch of the universe. The cosmos is ...

The “outside the universe” question gets tricky right off the bat, because first you have to define the universe. One common answer is called the observable universe, and it’s defined by the ...

So for all we know, just outside the observable universe there is a big bad wall. Or a brane-type singularity. Or fire-breathing pink unicorns preventing us from going any further.

Beyond the observable universe lie “unknown unknowns”: the subject of speculation rather than direct observation. 1 The 45.7 billion light-year radius includes only light sources.

Assuming the universe is bigger than the observable universe, we could also be able to detect the influence of objects outside our observable universe on objects towards our observable universe's ...

That’s because we know the universe isn’t infinitely old — we know the Big Bang occurred some 13.8 billion years ago. That means that light has had “only” 13.8 billion years to travel. That’s a lot of ...

However, given the enormity of the universe, even that incomprehensible number doesn't fill up much of the total volume. If there are 3.28 x 10 80 particles in the universe, that means there is ...