Space doesn't exist, it's just a mental paradigm we use for modeling relationships between objects. https://philosophy.inhahe.com/2020/10/29/space-doesnt-exist/ There's no boundary to how far away something can potentially go (other than that it must travel outward more slowly than the speed of light), if that's what you're asking. If space had an edge, you wouldn't be able to go beyond it. As far out as you go, that's how much space you'll conjure up in your mind.