One night, a long time ago, your great-grandfather walked outside. He saw a bright star shining in the night sky and wished earnestly and wholeheartedly for his strongest desire. He did this once a night, every night, for a year. But his wish was never granted. This broke him. He became angry and bitter, blaming this distant ball of gas for his unfulfilled desire. Your great-grandfather wanted revenge. So, for an hour every night for 10 years he worked and trained and persevered for his desire to exact vengeance. Finally, on the last day of the tenth year he was ready. He walked out of his home that night, picked up the first rock he saw and threw it at the star, the star that never made his wish come true. The rock flew out of his hands at an impossible speed and began its journey to that star. Many years later, the rock made its destination. This tiny, inconsequential rock impacted the star in all its velocity and did...nothing. It didn't hurt the star, it didn't move it, it didn't change its composition in any meaningful manner. But the star noticed. For many years the star watched your great-grandfather train in his unfounded hatred against the star. And for longer than a human lifetime the star watched the rock pass other planets and stars and galaxies to make its way to it, carrying with it a bitter man's hate. The intention of the act, and not the act itself captured the star's attention, and drove it to fury. In return, the star threw it's own pebble back through the cosmos. It sped past planets and stars and galaxies to make its way to Earth. However, the star, despite its age and power and wisdom, has no hands; it couldn't throw its pebble with complete accuracy, and it missed the Earth by a hair. The rock was captured by the gravity of the planet, and so it spins around the Earth to the constant dismay of the star, yet a constant reminder for humankind: for the former, don't grant wishes to fools, and the latter, don't seek revenge against billion year objects that by no right should have sentience. And that is how the moon came to be, child.