Jupiter 's ring system was the third to be discovered , when it was first observed by the Voyager 1 probe in 1979 .
Jupiter 's ring system was observed more thoroughly by the Galileo orbiter in the 1990s .
Jupiter 's ring system was the third to be discovered , when it was first observed by the Voyager 1 probe in 1979 , and was observed more thoroughly by the Galileo orbiter in the 1990s .