Galileo I (1985): First orbiter of Jupiter. Launched atmospheric probe. Was later turned to focus on the moons as their attributes became widely known.
Galileo II (2001): Passed through the Jupiter-Io flux tube and had its communications disabled.
Galileo III (2008): Carried the Io lander, which successfully landed near a lava flow. Functioned for three hours.
Galileo IV (2008): Carried Europa lander, which crashed and was unable to send back data. Galileo IV entered orbit around Europa and further mapped the planet and its ocean.
Galileo V (2020): Launched from the surface of the moon. Delivered a submersible that was successfully landed on Europa and melted through the ice. Discovered evidence of biological activity, though no indisputable evidence of life.
Galileo VI (2034): Sample return mission for Io.
Galileo VII (2034): Ganymede lander; sample return rocket failed to ignite.
Galileo VIII (2054): The Europa Biochemical Laboratory successfully touched down on Europa and began a five year mission. A small rover collected samples from cracks and faults in the ice. Biological activity confirmed, yet again no samples of lifeforms discovered.