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Date First Human Lands on Mars

Question

A human mission to Mars has been the subject of science fiction, aerospace engineering, and scientific proposals since the 20th century.

In the early 21st century, numerous US, European, and Asian organizations were developing proposals for human missions to Mars, and dozens of Mars mission plans have been devised over the decades since the dawn of spaceflight.

When will the first humans land successfully on Mars?

This question resolves as the date on which the first crewed vehicle touches down on Mars successfully. A 'successful' landing is defined, for the purposes of this question, as one in which at least one crew member survives the landing. A 'crewed vehicle' is defined here as containing at least one conscious flesh-and-bone human.

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