It’s hard for me to comprehend the idea that space never ends. Is there really no boundary to space? How do scientists know this?

Question

It’s hard for me to comprehend the idea that space never ends. Is there really no boundary to space? How do scientists know this?

In: Planetary Science

Answer 1

We don’t know and no credible scientist claims to. Maybe it loops around, the same way that if you fly west long enough on earth you’ll get back to the same spot. Maybe there’s a wall or something. We will likely never find out, because due to some factors there is a known limit to how far we can look.

Kurzgesagt did a cool video on this: https://youtu.be/isdLel273rQ