In 1610, Galileo Galilei observed 4 moons rotating around Jupiter
Galileo Galilei discovered it on 7 January 1610.
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jupiters ice moon is Io
Ganymede is Jupiter's largest moon. The top four of its largest moons are Europa, Io, Callisto, and Ganymede.
Europa is Jupiters moon.
Jupiters moon is thought to contain microscopic ice crystals but this theory has not yet been proven
Jupiters moon Ganymede
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Obviously not, Europa is a moon, not a star.
Jupiters biggest moon is Ganymede
Jupiters Moons