How was the moon Europa formed?

Answer 1

Europa and the other three Galilean moons display characteristics that suggest they formed as planetesimals during the early solar system, becoming satellites of the larger clump that became Jupiter. Europa appears to be mainly silicate rocks like those of the Earth and the Moon.

The possibility of a liquid ocean beneath a thick ice crust is what makes Europa intriguing for the search for other life forms in the solar system. Tidal forces from its rotation may have melted subsurface ice layers, creating a liquid layer. The surface, exposed to space, remains frozen as rock-hard ice about 10 to 30 kilometers thick.

Answer 2

Europa is believed to have formed through a process called accretion, where gravity caused gas and dust in the early solar system to come together and form a moon. It likely underwent further shaping through impacts and geological activity.