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Home An artist’s depiction of the Earth Reliant, Proving Ground and Earth Independent thresholds, showing key capabilities that will be developed along the way. (NASA) An artist's depiction of the Earth Reliant, Proving Ground and Earth Independent thresholds, showing key capabilities that will be developed along the way. (NASA)

An artist’s depiction of the Earth Reliant, Proving Ground and Earth Independent thresholds, showing key capabilities that will be developed along the way. (NASA)

An artist's depiction of the Earth Reliant, Proving Ground and Earth Independent thresholds, showing key capabilities that will be developed along the way. (NASA)

An artist’s depiction of the Earth Reliant, Proving Ground and Earth Independent thresholds, showing key capabilities that will be developed along the way. (NASA)

This table shows high-level, near-, and far-term decisions that must be made to continue on the journey to Mars. (NASA)