Ok so I heard this question a few times already and couldn't remember how it went so I decided to put my brain to the test, I used my algebra to use and complete it.
If the Earth were shrunk down to the size of a basketball (radius:4.69 inches) the Moon would be a tennis ball (radius: 1.2768 inches, to be exact) 23.5 feet away.
The Sun would be a 42.6-foot sphere (source) located 1.7 miles away.
The closest star, Proxima Centauri, would still be 463,151 miles away – almost twice the distance of the actual moon."