منابع مشابه
Tracking Capability for Entry, Descent and Landing and its support to NASA Mars Exploration Rovers
1. INTRODUCTION In January 2004, the two NASA Mars Exploration Rovers (MER) – also known as Spirit and Opportunity-arrived at Mars. Before they could start their scientific investigation looking for traces of water and evidence of possible life in the past, the two rovers had to pass through a dangerous stage of entry, descent and landing (EDL). Each rover had to safely enter and descend throug...
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Twice burned by mission failures last year, NASA managers last week unveiled a new 15-year blueprint for Mars exploration. The revamped strategy allows for doing more science, but at a slower pace, while delaying a sample return until well into the next decade.
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The nuclear thermal rocket (NTR) is a proven, high thrust propulsion technology that has twice the specific impulse (Isp ~900 s) of today’s best chemical rockets. During the Rover and NERVA (Nuclear Engine for Rocket Vehicle Applications) programs, twenty rocket reactors were designed, built and ground tested. These tests demonstrated: (1) a wide range of thrust; (2) high temperature carbide-ba...
متن کاملComparing NASA and ESA Cost Estimating Methods for Human Missions to Mars
To compare working methodologies between the cost engineering functions in NASA Marshall Space Flight Center (MSFC) and ESA European Space Research and Technology Centre (ESTEC), as well as to set-up cost cngi~iccri~~g ciipbiiiiies fur future manned Mars projects and other studies which involve similar subsystem technologies in MSFC and ESTEC, a demonstration cost estimate exercise was organize...
متن کاملPower Requirements for the Nasa Mars Design Reference Architecture (dra) 5.0
This paper summarizes the power systems analysis results from NASA’s recent Mars DRA 5.0 study which examined three architecture options and resulting mission requirements for a human Mars landing mission in the post-2030 timeframe. DRA 5.0 features a long ~500 day surface stay “split mission” using separate cargo and crewed Mars transfer vehicles. Two cargo flights, utilizing minimum energy tr...
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ژورنال
عنوان ژورنال: Nature
سال: 1987
ISSN: 0028-0836,1476-4687
DOI: 10.1038/326320e0