Galileo Galilei observed that the moon's surface is the not smooth.

Only a few centuries before Galileo had risked ridicule when, based on telescopic observations, he suggested that the moon's surface was not smooth. ... Nonetheless Galileo did not see perfection when he looked through his telescope at the moon in the early 17th century. He saw instead a surface that reminded him of earth.

answer: i'm not sure which is which for i get confused on it all the time but i can tell you that the answer lies with the convex and concave devices. i hope this you. have a good day and best of luck to you!

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