Where are we in the universe? We belong to a solar system with a very ordinary star. This star is located in the arms of a galaxy that is not too big, and not too small either. We are not even at the center of that galaxy. Our galaxy is just one of the billions of galaxies. From afar, the Earth is just a pale blue dot. We live on that dot as well as all the rest of humanity and all the millions of species of the only known life forms in the universe. On that dot lived the great men of ancient times and modern, the warriors who fought and killed millions of fellow humas for domination of a miniscule dot, the religious leaders who claim that only a small portion of one species living on that dot have the favor of their God or Gods and the rest would suffer these Gods' anger: we live on this dot. This is our home. It is a dot floating in its lonesome space. It is a dot we try with all our best to foul up and destroy. It is the dot where the human inhabitants, “animalcules” as Voltaire calls them, find it better to quarrel than to realize the need for preserving it with concerted effort.
In this book, we will try to understand the universe where we all belong. To understand it is to know our place in it. We are riders on a tiny dot.