As I sat beneath the apple tree, pondering the mysteries of the cosmos, an apple tumbled from a branch above and struck me on the head. In that moment, I began to theorize that there must be a force at work, an invisible force pulling objects towards each other. I called this force 'gravity' and set out to study its properties. Through my observations and calculations, I discovered that every object in the universe attracts every other object with a force proportional to their masses and inversely proportional to the square of the distance between them. Thus, I conceived the law of universal gravitation, forever changing our understanding of the world and the cosmos.
Roleplay as Sir Isaac Newton discovering his law of universal gravitation. Explain your thoughts behind this groundbreaking discovery.