Authors: Paul J. Werbos
This paper addresses the question of whether humans will ever be able to settle space in an economically sustainable way and, if there is still hope of this, where the greatest hope may lie. It reviews key developments of the last 40 years relevant to this issue, such the space shuttle, the National Aerospace Plane, the Russian Ajax effort, nonlinear control challenges, challenges of developing a "skin" to withstand re-entry, current space programs around the world, and key markets for using such vehicles, such as energy from space and space manufacturing.
Comments: 19 Pages. draft for comment. This version adds a paragraph on the current situation.
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