The incredible shrinking robot. Final Frontier, p. 26. These devices, which range from piano-playing people to bell ringers, are not true robots because they are not programmable. Research the history of automated systems. Robots have long been associated with outer space.
Craters form on planets and moons when meteors hit.
The shape of a crater reveals a lot about the power of the impact. Drop a metal ball bearing into a dishpan filled with flour. Remove the ball with a magnet and measure the width and depth of the crater. Try different-sized balls dropped from different heights.