Has scientist given a name to the universe we're in? I've heard of something called Epsilon and Delta? Is that right? Delta?

Stratmando

Wikipedia says
"The universe is defined as everything that physically exists: the entirety of space and time, all forms of matter, energy and momentum, and the physical laws and constants that govern them".
So if their is another Universe, it would automatically be part of ours.
Also, if the Universe is expanding, what are we expanding into?

sarnian

Wikipedia is just an on-line reference "book", produced and amended by Internet users.
So whatever Wikipedia states should often be seen as questionable reference data.

The universe is NOT everything that physically exists.
The important lacking phrases here are : "to us" and "space-time".
So the universe is everything that physically exists to us within our space time.
An important difference, as it places us within the limits of space time.
For us there is no outside to our universe. We are bound by our space-time.

There is no reason to assume or reject anything "outside" our universe.
It may be, it may not be, but we will never know. We are bound to this universe.
Even the question into what does the universe expand can not be answered.
One reason is that the universe is not like a balloon being blown up.
There is no balloon "skin". All that increases is space-time.

Again : anything that refers to "outside" our universe is pure speculation and phantasy.

Timatron

They had a name for the Milky Way before Edwin Hubble discovered that we wernt the only Galaxy. Personally I think the name "Adonai" would be cool. It would be significant as well seeing as its on of Gods names

TUT317

I'll have a go at it. I am sure that the scientists out there will correct me if I am wrong.

Classical physics ( mainly Newton and Einstein) postulates only one universe. That is the universe we experience in three dimensions and the one of time.

Other universes are mathematically possible when we move away from classical physics and look at non-classical theories. This does not mean that other universes exist. It only means they are possible.

One such example is the many universes interpretation of quantum mechanics. This explanation suggests that every possible event exists in its own universe. There are an infinite number of universes that can account for every thing that could have happened in the past, but didn't. If a flip a coin in order to decide if I am going to the movies and it comes down heads I will not go. But in a parallel universe the coin landed on tails so I actually went to the movies. The frustrating part is that we are never aware of alternative outcomes.

Events keep branching off into different universes. As crazy as it sounds it is possible.
Another theory which deals with parallel universes is know as M- theory. But this is a different interpretation altogether.