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Constraints of Mars Exploration, Operations conducted from Near-Mars may permit "Human-equivalent" Field Work, Long means Few to Many Decades, A Number of Distinct Phases each take place over Extended Period of Time, Operations conducted from Mars Surface involve Short Round-trip Light Times, Short means Few to Many Years, Extended Period of Time may be Long, "Definitive Study" requires Earth Laboratory -equivalent Sample Analysis, Long characterizes Earth-based Operations, "Exploration" then "Detailed Study", Interpretation and Discovery leads to Response to New Knowledge