dehammer wrote:
"The balloon expands into the air surrounding it. There is air inside and there is air outside, the balloon is the edge of it."

You just wrote "air outside."

Look up there at your sentence and see it. That is exactly what you wrote.

We are talking about the universe.

There is no outside.
There is no outside.
There is no outside.

Will it help you if I say it a few more times?

There is no outside.
There is no outside.
There is no outside.

Your analogy is meaningless.

DA Morgan