If Space is a vacuum with nothing in it, then what would the edge of the universe even mean

Question

…it would be a ‘border’ between nothing and nothing?

In: Planetary Science

Answer 1

Space isn’t nothing. There’s gravity, radiation, and molecules/atoms and the base fundamental. In some parts there are heavy concentrations (planets, stars, and solar systems). In other parts there are an extreme lack of those things which is called the interstellar medium (interstellar space or the empty space between solar systems). There’s about 3 to 10 atoms per cubic meter in this ’empty space.’ The edge of the universe is a point where there is no longer the effect of gravity, radiation of any kind, and a true 0 atoms per cubic meter. There is true nothingness not even the fundamental laws of physics apply.