> Maybe it would be good for the sceptics to try ChatGPT and ask "What happens to X when you let it go from your hand on earth/in outerspace? please explain your reasoning."

And this will show the sceptics exactly what? That ChatGPT language models have suffecient info about the ideas of space to be reasonably correct for some definition of correct.

It can definitely cannot predict something outside it's area of knowledge, or construct plausible theories. As can be evidenced by numerous examples where it's plain wrong even in the simplest of cases.