Quote:
Originally Posted by Justanotherrandomguy
I think we could be talking of seventy year gap, ie 2058.
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Yes, that's plausible.
It is possible that the technology that may get developed for the manned Mars mission will enable cheaper, faster transit to Neptune. If so, it might be earlier, but I wouldn't bet on a launch for a Cassini-like mission to Neptune before 2030.