Once again, NASA’s human space-flight program is looking for a destination. It happened in the early 1970s, after US astronauts had left the Moon for the last time; then in the 1990s, after the collapse of a costly vision of sending astronauts to Mars; and again in 2010, when US President Barack Obama abandoned a plan to return humans to the Moon because he did not consider it ambitious enough ...

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Dueling Visions Stall NASA