I suggest that the estimated cost of $1.5 trillion in the commentary by O. Glenn Smith and Paul D. Spudis for a nine-mission Mars program, while providing a useful reference point, is unrealistic.
I suggest that the estimated cost of $1.5 trillion in the commentary by O. Glenn Smith and Paul D. Spudis for a nine-mission Mars program, while providing a useful reference point, is unrealistic.
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