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Astronomy

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    $\begingroup$ Define "hard". You have to squeeze $4 billion plus out of governments, and that's before you get off paper, but after you have at least a partial design and detailed plan. Then you have to build stuff. And it has to work, because you don't get second chances. $\endgroup$
    – StephenG - Help Ukraine
    Commented Mar 12 at 0:27
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    $\begingroup$ Voyager 2 was able to use multiple gravity assists. $\endgroup$
    – PM 2Ring
    Commented Mar 12 at 1:28
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    $\begingroup$ space.stackexchange.com/a/45634/37747 $\endgroup$
    – Nilay Ghosh
    Commented Mar 12 at 3:07
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    $\begingroup$ Setting a goal and planning is difficult, but it is possible. But what is the purpose of such a journey? $\endgroup$
    – ayr
    Commented Mar 12 at 10:15
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    $\begingroup$ Further to StephenG-HelpUkraine's excellent comment, can you also define 'plan'? Is that simply to plot the course, or does it include all the administration and logistics, as for instance what cargo is carried and even, how the cargo is distributed in the holds? $\endgroup$
    – Robbie Goodwin
    Commented Mar 15 at 21:13