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 is not empty, and in the known dimensions of the universe, has no edge. Space is constantly expanding into itself, creating more space. As light is the “speed limit” of the universe, the observable universe is ~13.8 billion years.

But, since that is how we measure “the beginning” everything since then has been expanding, and the farther we look, the faster the universe seems to be moving away. In the idea of cosmic inflation, *space actually moved faster than light.*

The lamba cold dark model presents this idea that “dark energy” (basically a place holder for something not yet understood) is the force behind this expansion, and most of the matter in the universe being “dark matter” that doesn’t interact with light or electromagnetic fields (another place holder for something not understood.)

So, since the universe has always been expanding with the expansion of space, this light has now traveled ~46.5 billion light years. With an euclidean “width” of the universe of around 93 billion light years “edge to edge.”