The only humans yet to set foot on the Moon are American astronauts in the series of six Apollo landings that ended 53 years ago. But last January, President Donald Trump’s Inaugural Address proclaimed a far more extraordinary goal: “We will pursue our manifest destiny into the stars, launching American astronauts to plant the stars and stripes on the planet Mars. . . . Americans are explorers, builders, innovators, entrepreneurs, and pioneers. The spirit of the frontier is written into our hearts. The call of the next great adventure resounds from within our souls.”

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