# Dimensions vs Universes: Understanding the Distinction and Connection

• thepopasmurf
In summary, there are multiple interpretations of the terms "higher dimensions" and "multiple universes". Higher dimensions can refer to non-physical dimensions used to explain the curvature of the universe, physical dimensions outside of our universe, or curled-up dimensions within the universe. Multiple universes can refer to physical dimensions outside of our universe or the concept of different time-lines within the universe.

#### thepopasmurf

I always here talk of there being multiple universes or there being higher dimensions. When people use these terms are they referring to the same thing? If not, what's the difference?

thepopasmurf said:
I always here talk of there being multiple universes or there being higher dimensions. When people use these terms are they referring to the same thing? If not, what's the difference?

Hi thepopasmurf!

Higher dimensions refers to either

i] spatial dimensions "outside" the universe, to "explain" how the universe is curved (for example, "the universe is like the surface of a balloon, and the universe expands the same way as a balloon expands, through an extra dimension") … these have no physical existence

ii] spatial dimensions "outside" "our" universe, in which "our" universe is a "brane" floating around, and maybe sometimes hitting other universes … these (if they exist) do have physical existence

iii] spatial dimensions "inside" the universe … these are "curled-up" dimensions, too small to see, in whch the strings of string theory vibrate

Multiple universes either refers to ii] above, or to some weird quantum theory idea which is basically like "different time-lines" in science fiction (but respectable! )

## What are dimensions and universes?

Dimensions refer to the measurements of space and time, while universes refer to separate physical or conceptual realms that may exist beyond our own.

## How many dimensions are there?

According to string theory, there are 11 dimensions in total, with 3 spatial dimensions (length, width, and height) and 1 time dimension being the most familiar to us.

## Is it possible for there to be other universes?

This is a topic of debate among scientists, but some theories suggest that there could be multiple universes, each with its own set of laws and physical constants.

## What is the relationship between dimensions and universes?

Dimensions are the building blocks of universes, as they determine the fundamental structure and properties of a universe. Different combinations of dimensions can create vastly different universes.

## Can humans ever understand or experience other dimensions or universes?

It is currently not possible for humans to physically travel to or experience other dimensions or universes. However, through theoretical physics and mathematics, scientists can explore and understand the possibilities of these concepts.