Lets g i got 69 thanks on my profile My actual question: How does the universe work and what is beyond it. It doesn't have to be correct, it just needs to be a theory (at least)

The universe is everything, so it isn't expanding into anything. It's just expanding. All of the galaxies in the universe are moving away from each other, and every region of space is being stretched, but there's no center they're expanding from and no outer edge to expand into anything else.

you would expect a sound wave to speed up. - b)

from

explanation:

wind is defined by the direction it blows from.   for example, a wind blowing from north to south is called a northerly wind.