The great scientist isaac newton said that his long studies of the moon gave him headaches. what do you think is complicated studying the moon?

me i have been on this question for 1 hour and a half. tank you so much for me.

Well, using Math to see how far the Moon is from the Earth could be hard. Also, he saw that the Moon is moving in a "circle" instead of flying off, so the Earth did have a pull on the Moon so that it didn't fly away. Newton had to use Math in order to be able to identify what it's now called gravity. There's a lot that the Moon has to offer, there were no computers back then, so there's was no calculator and everything had to be done by hand.

The answer is c) tons