NASA has selected another class of astronauts, some of them young enough to be assigned a mission to Mars if the U.S. space agency maintains anything like its announced schedule for pushing human exploration into deep space. All of them are impressive, and if past is prologue almost all of them will be up for whatever the job throws at them. As has been the case with every group of U.S. astronauts but one, there are more men than women. The eight-member Class of 2015 was split down the ...


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