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In Pale Blue Dot, Carl Sagan continues his tour with us exploring space and time, bringing humanity through the front lines of new space. Sagan tells of human travel to space, with both manned and unmanned spacecraft, which are already being carried out or being planned. Sagan called for us to continue reaching out to other worlds in the solar system and beyond, not only for knowledge, but also for the long-term sustainability of the human species and its offspring. - fascinating is perhaps Carl Sagan 's best Book. "- The Washington Post Book World "Bringing readers far beyond Sagan 's cosmos sees the future of man among the stars." - Chicago Tribune "The Day Earth Smiled". Photo source: NASNJPL-Caltech / Space Science Institute. Below: the sun 's Glint Reflects Off the Pacific Ocean "photo source: International Space Station (ISS). Nasa. Looking at mankind 's future in space