I just read this in the book Raising Freethinkers, and just had to share it.
Now, just run your fingers through all of those stars in our own galaxy.
Then, take it a step further. Now, pretend that the whole Milky Way galaxy is one grain of sand. The rest of the sandbox represent how many galaxies are in the universe.
Now, run your fingers through all of those galaxies in our universe.
To be more accurate, the sandbox should be a 20-foot circle, and the sand should be 1 foot deep. Either way, this fun little explination of the solar system & universe is sure to be a hit!