[6] In 1997 a NASA Mars Exploration Study Team was put together and made a more detailed version of the original design reference mission.This report summarizes their work and describes a plan for the first human missions to Mars, using approaches that are technically feasible, have reasonable risks, and have relatively low costs.The architecture for the Mars Reference Mission builds on previous work of the Synthesis Group (1991) and Zubrin's (1991) concepts for the use of propellants derived from the Martian Atmosphere.The stated purpose of the Reference Mission was to stimulate further thought and development of alternative approaches: "It is intended to identify and clarify system "drivers", or significant sources of cost, performance, risk, and schedule variation.Comparing alternative approaches provides the basis for continual improvement to technology investment plans and general understanding of future human exploration missions.
Artist concept of a Mars habitat, 1993
Design Reference Mission 3.0
Concept for NASA Design Reference Mission Architecture 5.0 (2009)