The Galileo spacecraft introduced in 1989 on an objective to study Jupiter and its moons. Ganymede, the third moon from Jupiter, was imaged by Voyager 1 on Mar. 1, 1979. No other moon was known to have a magnetic field at the time.
The Galileo spacecraft released in 1989 on an objective to study Jupiter and its moons. Ganymede, the 3rd moon from Jupiter, was imaged by Voyager 1 on Mar. 1, 1979. No other moon was known to have a magnetic field at the time.