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I understand the five-year duration of the HOPE Callisto mission to be at the edge of future manned missions for NASA. Are there any missions planned to be longer than that, by NASA or anyone else?

Further reading:

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    $\begingroup$ I suspect not and even if there was any relation to reality would be tenuous $\endgroup$ – Slarty Mar 5 '18 at 19:57
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    $\begingroup$ Interesting to read about, food for thought at least... $\endgroup$ – uhoh Mar 7 '18 at 14:03
  • $\begingroup$ Do proposals to colonize Mars with one way trips count? $\endgroup$ – Quentin Clarkson Mar 7 '18 at 22:50

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