> The alignment was important because it allowed visiting four planets with one spacecraft. So you only had to launch one spacecraft. (We launched two anyway.)

> The alignment was important because it allowed visiting four planets with one spacecraft. So you only had to launch one spacecraft. (We launched two anyway.) IIRC the second probe was mainly intended as a backup to the first one, but visiting Titan and visiting Uranus/Neptune were mutually exclusive, and visiting Titan was higher priority, so if the first probe succeeded the backup could be (and was) sent on the four planet track.