Ganymede is the largest moon in our solar system and the only moon with its own magnetic field. The magnetic field causes auroras, which are ribbons of glowing, electrified gas, in regions circling the moon's north and south poles.
(Cf. https://solarsystem.nasa.gov/solar-system/our-solar-system/overview/)
In The Expanse (novel series), Ganymede Station was one of the first permanent human settlements in the outer planets, built as a long term colony with large domes filled with food crops. It was known as the safest station in the Jovian system, and many humans from other colonies travelled to Ganymede to deliver their babies.
Now, that's just another #Booktrack mini-album, a first dedicated visit to Ganymede and I'm sure not the last.