Ganymede is the third Galilean moon of Jupiter, fifth planet in the Sol system. It is the largest moon in the system and is named after the cupbearer of the Greek gods in Terran mythology.
In the 23rd century, Montgomery Scott of the Federation starship USS Enterprise mentioned a mysterious "green drink" he found on Ganymede, and later shared with the Kelvan Tomar. (TOS: "By Any Other Name")
- It's possible the green drink was Aldebaran whiskey, as revealed by Jean-Luc Picard in TNG:"Relics."
- In VOY: "Life Line", Dr. Lewis Zimmerman mentions a tour of the lava flows on "Jupiter's third moon". He may have been referring to Ganymede, the third Galilean moon, rather than Amalthea, Jupiter's actual third moon, although Io is the only (known) moon of Jupiter to display active volcanism.