NASA NTRS · 20130014012
Footprints on Mars
Abstract
The first three human missions to Mars should be to three different geographic sites. Maximize mobility to extend the reach of human exploration beyond the landing site. Maximize the amount of time that the astronauts spend exploring the planet. Provide subsurface access. Return a minimum of 250 kg of samples to Earth.
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Drake, Bret G.. 2013-06-12. Footprints on Mars. https://ntrs.nasa.gov/citations/20130014012
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