Sagan has been an inspirational figure to for quite a few years, but there are a couple of books by him that I hadn’t gotten around to yet. Pale Blue Dot is another commendable popular science book, where he explores issues surrounding space travel and colonisation. The treatment of subject matter such as lunar and martian exploration and settlement, manipulation of asteroids, etc. is accessible and clear, as well as well-argumented. It really challenges the reader to take a long-term view of the ecosystem on Earth, possible changes in climate (man-induced or not) that may prove fatal to our species, and the possibility of extra-terrestrial expansion to ensure the future of mankind, without looking away from the dangers involved in that grand quest.
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