An incremental, multiple-mission approach -- which envisions getting astronauts to Phobos by 2033, then down to the Martian surface by 2039 -- could make manned Mars exploration technologically and economically feasible.
An incremental, multiple-mission approach -- which envisions getting astronauts to Phobos by 2033, then down to the Martian surface by 2039 -- could make manned Mars exploration technologically and economically feasible.
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