Try it! Pre-pare a flashlight and two ping pong balls. In a dark room, align the flashlight and the balls horizontally. Illuminate one ball with the flashlight and observe the shadow it casts on the ball behind it.

1. What is the shape of the shadow? 2. How is the result of the experiment related to Aristotle's arguments about the shape of the Earth? 3. If you use a different object, like two Rubik's cubes instead of ping pong balls, will it cast the same shape of shadow? Explain.

What would life on Earth be like if it is not a sphere? ______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________