A few months ago I watched this Veritassium video where Derek went around asking people to place where the Moon (tennis ball) is in relation to the Earth (basket ball) scaling for the size of the balls.
Not so surprisingly, everybody (besides one guy, I’d say) placed it much, much closer than it actually is and Derek gave a brief explanation of why people’s estimation of this distance is normally off and showed what would be the most correct answer.
It was only a few days later that it came back to me and I started thinking:
“Would I make a correct estimation? What if the Earth was of a different size?
And more importantly, how far the Moon actually is from the Earth?”