Infinity in nature sounds like an untestable argument. If space was infinite, by definition we'd never be able to measure it's boundary to verify the claim. The

Infinity in nature sounds like an untestable argument. If space was infinite, by definition we'd never be able to measure it's boundary to verify the claim. The closest we could come is "we still haven't discovered a boundary to the volume of space". Basically the claims "beyond the farthest point you can measure there is more space" and "beyond the farthest point you can measure there is nothing" are equally plausable and untestable.