Z!P: I am amazed by the astronomers. These people are on Earth orbiting the Sun, which in turn revolves around the center of the galaxy (and so on). They can study this galaxy, determine the masses of stars, predict their development. It is the same as a child, riding a carousel in the center of the city park, will learn not only the structure and principles of the carousel, but also draw a map of the city with detailed plans of each building and tell the name of the next mayor.