Diperkirakan memiliki air dua kali lebih banyak daripada Bumi, Europa telah menyita perhatian para ilmuwan sejak astronom Italia Galileo Galilei mulai mengamati bulan paling besar keempat Jupiter tersebut, pada 1610.
Predicted to have water reservation twice as much as that of earth, Europe has   attracted the astronomers since the Italia astronomer Galileo Galilei started to observe the fourth biggest moon of Jupiter in 1610.