The conversation between human and AI assistant.
What exactly does it mean when you say the universe is "expanding"? Does the planck-length get bigger? How can there be more space between objects?
Okay, that's good to know. But if the universe is expanding, how can there be more space between objects? Doesn't space just go on forever?
While it's true that space seems to go on forever, it's also true that the expansion of the universe causes space to stretch, resulting in more distance between objects over time.