During the week of April 18, the executive-branch-chartered Science and Technology Policy Institute (STPI) issued a review, which concluded that NASA’s plan to send humans to Mars by 2033 is not feasible.  While I would love to dispute this report, it actually understates the problem. If one accepts as necessary, as STPI was instructed to do, NASA’s “Exploration Campaign”—including the decades-in-development Space Launch System (SLS) and Orion capsule as ...

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