"Astronomers have discovered new auroras over Jupiter's four largest moons: Io, Europa, Ganymede, and Callisto, observable at visible wavelengths. The new auroras reveal in greater detail the composition of the thin atmospheres of these Jovian moons, including traces of oxygen and sodium, but only minimal water vapor. "

Never expected that moons could have auroras

Me neither! That's so cool. :)

Wouldn't that just mean that the moon has a sufficiently sized magnetic field

[removed]

Exactly right

Just curious, but wouldn’t it be Jupiters magnetosphere, causing the auroras?

[removed]