141-Page PDF Circa 2003 by @NASA of Conceptual ‘In-Space Vehicles’ for Planetary Exploration
I stumbled upon this doc in the NASA NTRS archives. It’s dated November 2003 and proposes ‘five concept missions,’ along with some of the vehicles and engines – and a lot of graphs and math required – to achieve a positive outcome of ‘Human Exploration of the Outer Planets.’ Awesome!
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