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?
I have a question about the universe. What exactly does it mean when we say that the universe is "expanding"?
Currently, the most widely accepted explanation for the expansion of the universe is known as the Big Bang theory. It suggests that the universe originated as a very hot, very dense, single point in space, and then rapidly expanded.