Sol is the name given to the star of the Solar System. Also known as the Sun, it is the star Earth orbits. Sol is almost entirely responsible for life on Earth, as it provides it with light and heat. Because of that, life on Earth developed, leading from small bacteria to the birth of the human race. Since the discovery of Quantum travel, Earth is still heavily populated by civilians and military personnel alike, making it one of the most densely populated stars in the Universe.