 The Galileo spacecraft was the first to have entered orbit around Jupiter , arriving in 1995 and studying the planet until 2003 . During this period Galileo gathered a large amount of information about the Jovian system , making close approaches to all of the four large Galilean moons and finding evidence for thin atmospheres on three of them , as well as the possibility of liquid water beneath their surfaces . It also discovered a magnetic field around Ganymede . As it approached Jupiter , it also witnessed the impact of Comet Shoemaker – Levy 9 . In December 1995 , it sent an atmospheric probe into the Jovian atmosphere , so far the only craft to do so . 
 The Galileo spacecraft was the first to <a href='been_done' title='1'><mark>have</mark></a> entered orbit around Jupiter , arriving in 1995 and studying the planet until 2003 . During this period Galileo gathered a large amount of information about the Jovian system , making close approaches to all of the four large Galilean moons and finding evidence for thin atmospheres on three of them , as well as the possibility of liquid water beneath their surfaces . It also discovered a magnetic field around Ganymede . As it approached Jupiter , it also witnessed the impact of Comet Shoemaker – Levy 9 . In December 1995 , it sent an atmospheric probe into the Jovian atmosphere , so far the only craft to do so . 
Da Galileo spacecraft was the first to done entered orbit around Jupiter , arriving in 1995 and studying the planet til 2003 . During dis period Galileo gathered a large amount of information about the Jovian system , making close approaches to alll of tda4 large Galilean moons and finding evidence fir thin atmospheres on three of em , as well as thdaossibility of liquid water beneath their surfaces . It also discovered a magnetic field around Ganymede . As it approached Jupiter , it also witnessed thedapact of Comet Shoemaker – Levy 9 . In December 1995 , it sent an atmospheric probe into the daian atmosphere , so far the oda craft to do so .