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Mining the Sky Helix BookIbilities Join John S Lewis as he contemplates milking the moons of Mars for water and hollowing out asteroids for space bound homesteaders all while demonstrating the economic and technical feasibility of plans that were once considered pure fictio. The space mining is of a hook then an overall theme as Lewis spends than half of the book covering the history of space study the development of the tech needed to study space and the fall of NASA He is or less begging people and politicians to get back to space exploration dangling the idea of asteroids stuffed full of platinum as the carrot Some good foundation and background work but I wanted to see speculation on the development of this possible future industry

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characters Mining the Sky (Helix Book) ¶ PDF, DOC, TXT or eBook Ü While we worry over the depletion of the earth's natural resources the pollution of our planet and the challenges presented by the earth's growing population billions of dollars worth of metals fuels and life sustaining substances await us in nearby spaWhile we worry over the depletion of the earth's natural resources the pollution of our planet and the challenges presented by the earth's growing population billions of dollars worth of metals fuels and life sustaining substances await us in nearby. John S Lewis is a professor of planetary science at the University of Arizona His expertise on the composition and chemistry of asteroids and comets really shines through in this book The premise of the book is to explore the possibilities of a self sufficient space program Lewis argues that with initial investment in some properly planned space missions in contrast to the flags and footprints missions of the Apollo program a reasonably profitable space economy can be set up He explores the economic and technological possibilities of having a permanent base of operations on the moon beaming solar power in the form of microwaves back to the Earth He proposes that for this to be economically feasible the majority of propellants and photovoltaic cells be manufactured using processed materials from the moons regolith The major obstacle that this plan runs into is the lack of hydrogen on the moon; hydrogen is essential to the manufacture of water and propellants If space missions are to be economically feasible the book proposes that we mine near earth asteroids NEO's Over half the NEO's are dead comet nuclei rich in water and other volatiles The remaining half are rich in metals With these resources solar cells can be manufactured and placed in geocentric earth orbit beaming cheap solar power 247 to Terra He then outlines several possibilities of how the space industry can export materials and power to the resource limited earth such as helium 3 from the moon and the atmospheres of giant planets He argues that humanity's expansion into space forced by overpopulation and dwindling resources is inevitable This book was a pure joy to read It is well thought out and written each chapter begins with a brief story like narrative taking place in the future showing us various possibilities and exiting our imagination

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Space In this visionary book noted planetary scientist John S Lewis explains how we can mine these precious metals from the asteroids comets and planets in our own solar system for use in space construction projects And this is just one of the poss. The most interesting thing for me was his compelling argument that NEO's asteroids and expired comets in orbits that cross Earth's are much attractive for resource extraction than the moon First the valuable materials metals and water are highly concentrated in the NEO's and second they are less expensive to travel to and from because of their significantly lower gravity than the moon Could it be that Obama's space advisers were influenced by Lewis in their decision to promote a human mission to a NEO over a return to the moonI think he let his enthusiasm for space exploration and colonization get the better of him at times such as when he makes rather extreme estimates of population growth and the resulting inevitability of human missions to NEO's and Mars in the near termStill I found it interesting to the point that I would definitely acuire a revised edition if he were to publish one and I may re read this edtion some day if he doesn't