For several decades it has been widely accepted that human space exploration is the exclusive domain of government agencies. The cost of performing such missions, estimated in multiple reports to amount to hundreds of billions dollars over decades, was far beyond what private entities could afford. That arrangement seems to be changing. Buoyed by the success of its program to develop commercial cargo capabilities to support the International Space Station, NASA is becoming increasingly open to working with the private sector in its human space exploration plans. The new private-public partnership will make 'planet hopping' feasible.
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"This ... book offers a thoughtful and interesting perspective on the prospects for the future of human space exploration in the Solar System and beyond. ... This is a book that will be of interest to anyone who wants to understand the potential for the human race to move beyond its current confines. Most importantly, it is founded in reality rather than science fiction and, hence, provides a useful blue-print for space-policy makers to consult." (Martin Barstow, The Observatory, Vol. 137 (1258), June, 2017)