Comment by zitterbewegung

A large amount of Voyager 1 & 2 's success isn't just technological it is the ability to take advantage of a specific planetary alignment for a gravity assist [1] that can only occur every 175 years [2] .

[1] https://en.wikipedia.org/wiki/Gravity_assist [2] https://en.wikipedia.org/wiki/Voyager_1#/media/File:Voyager_...