 understanding of the formation of the rings of Jupiter ( by dust kicked up as interplanetary meteoroids which smash into the planet 's four small inner moons ) and observation of two outer rings and the possibility of a separate ring along Amalthea 's orbit ; 
 understanding of the formation of the rings of Jupiter ( by dust kicked up as interplanetary meteoroids which smash into the planet <a href='null_genetive' title='1'><mark>'s</mark></a>four small inner moons ) and observation of two outer rings and the possibility of a separate ring along Amalthea <a href='null_genetive' title='2'><mark>'s</mark></a>orbit ; 
Understanding of da formation of tdarings of Jupiter ( by dust kicked up as interplanetary meteoroids which smash into thdalanet  4 small inner moons ) and observation of two outer rings and thedassibility of a separate ring along Amalthea  orbit ;