Man has long been extinct, and Earth is strikingly peaceful in all its glory of picturesque settings and habitats. Now home to several living forms, Earth is a much-sought-after archeo-cosmological planet in the entire universe. With the mission 'To Avoid Pitfalls Leading to a Species' Extinction', Altairians on their fourth visit to Earth, discover the reason for man's extinction and in the process, become instrumental in reviving mankind. How the legacy of man was intricately and repeatedly maintained on Earth, how the association between man and extraterrestrial life was recorded for a long time and how man sustained his solar system forms the findings of the Altarians in Mankind Preserved.