Basketball-Tennis Ball Size Demonstration

From SEDSWiki

If you were at the 2005 national conference, you saw this demonstration. The size ratio between the Earth and the moon is very similar to the ration of a basketball to a tennis ball. In this scale, the distance between the two is 7.2 m, or 9.5 times the circumference of the basketball. Details on the math can be found here.

This is an excellent demonstration of the scale of space. You might consider to convert some other objects into the same scale just for further enlightenment.