Part 1 of Essay
You are hurtling across the abyss of space on an expedition to unexplored planets. Your only companion is a fellow astronaut: the three hibernauts who like in a deep freeze sleep will not be awakened until their skills are needed. An essential member of your crew is Hal, the electronic, almost-human brain that ceaselessl ....

Part 2 of Essay
.... of the solar system. You are searching the stars for evidence that man is not alone. On Earth-colonized moon, deep in the crater Tycho, a discovery has been made that has shattered the human concept of the universe. You are journeying toward something. You do not know what it is. You only know that it has been waiting for man to find it for three million years. All of a sudden, in the middle of your mission Hal, the super smart computer, takes over the controls of the ship, and the astronauts try to disconn ....