Because God created the infinite universe, doesn’t mean God is in that infinite universe, nor that His hemishere, which existed before the created infinite universe, in any way collides or hinders our universe in any way.
I say OUR UNIVERSE, ’cos there is no-one else but we humans in it. (And probably Heaven) God however is everywhere - inside and outside this infinite universe. Infinity of the universe doesn’t mean there can’t be a divine “outside” of it. He who thinks so, limits God down to earthly naturalism; - a secular philosophy, which is as wrong as anything that contradicts the Gospel!
And as to aliens out there - other human beings:
There are none! For then Jesus Christ would have had to do His terrible salvation of us twice or even repeatedly - which truly is unthinkable!
In another forum I wrote:
perhaps our earth and complete sun-system, which seems to waver in a complete empty room, might even be amidst heaven - watched by them like we look into an aquarium
All amidst the infinite universe, which’s end or infinity God only knows, because He created it.