01 Learned from the depths of the numbers

From then on, we started a new chapter in this book. We want to enter a new world and meet new people, which depends on 1 set of numbers to reveal:

As we all know, the solar system has 1 star, 8 planets, 194 moons, the Milky Way? There are about 1000 to 4000 billion stars. How many satellites are there in the Milky Way? At present, there are no exact numbers! It also seems impossible to estimate. As for the entire universe, how many stars, how many planets, how many moons are there in 1000 billion galaxies? For humans, it is already difficult to explore, or even if someone ca......