"What lies ahead of you is the investigation of the crater-gnawed Moon and the landing on Mars. You are expected to penetrate into the hotbed furnace of Venus, install stations on the satellites of the big planets and probe the opaque atmosphere of Jupiter and Saturn. You are going to study the Sun, near-Sun and interstellar space, and then the innumerable stars. By examining them one by one you will learn that some of the stars are very much the same as the Sun, while others are quite different."