The Mars Exploration Program Draft Plan through the next two decades would utilize more frequent lower cost missions to achieve compelling science and exploration for a larger community...government and US industry would partner to leverage current and emerging Earth and lunar products and commercial services to substantially lower the overall cost and accelerate leadership in deep space exploration.
In its 496-page solicitation, NASA outlines four 'design reference missions' that companies can bid on. Basically, the space agency is asking companies how they would go about fulfilling these tasks.
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