Galactic Exploration is a compilation of four closely related stories following the exploration of the Milky Way by the star ships Serengeti, Savannah and the Rift Valley. These three generational space ships are manned by clones and form part of the ongoing search for intelligent extra-terrestrial life. With the Serengeti heading out above the plane of the Milky Way, the Savannah exploring the outer reaches of the galaxy, and the Rift Valley investigating possible alien signals within the galactic core, this story examines the Rare Earth Hypothesis from a number of different angles.