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Showing results for tags 'manned mars mission '.
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https://ntrs.nasa.gov/search.jsp?R=20140008733 Props to @nyrath, as always. TL;DR 'Afterbuner' design with hydrogen injection into the exhaust of a dusty plasma reactor results in Isp=32000 sec, allowing for a single-stage trip from Earth to Mars orbit and back, hence a high degree of reusability.