Editing Mariner program (section)

==Mariner Jupiter-Saturn==
{{main|Mariner Jupiter-Saturn}}
Mariner Jupiter-Saturn was approved in 1972 after the cancellation of the [[Grand Tour program]], which proposed visiting all the outer planets with multiple spacecraft. The Mariner Jupiter-Saturn program proposed two Mariner-derived probes that would perform a scaled back mission involving flybys of only the two gas giants, though designers at JPL built the craft with the intention that further encounters past Saturn would be an option. Trajectories were chosen to allow one probe to visit Jupiter and Saturn first, and perform a flyby of Saturn's moon [[Titan (moon)|Titan]] to gather information about the moon's substantial atmosphere. The other probe would arrive at Jupiter and Saturn later, and its trajectory would enable it to continue on to [[Uranus]] and [[Neptune]] assuming the first probe accomplished all its objectives, or be redirected to perform a Titan flyby if necessary. The program's name was changed to [[Voyager program|Voyager]] just before launch in 1977, and after ''[[Voyager 1]]'' successfully completed its Titan encounter, ''[[Voyager 2]]'' went on to visit the two [[ice giants]].<ref name=butrica/>