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?
That makes sense. But how can the universe expand? Does the Planck length get bigger?
The Planck length refers to the smallest possible length that has any meaning within the laws of physics. While the universe is expanding, there is no evidence to suggest that the Planck length is increasing. It's simply a fundamental constant of the universe.