Two close-up views of Ganymede, the largest moon in our solar system, taken 25 years apart!

30 years ago on June 27, NASA's Galileo spacecraft performed humanity's first-ever flyby of Jupiter's icy moon Ganymede—revealing that it had a magnetic field. Galileo flew within 519 miles (835 km) of Ganymede.

Nearly 25 years later, in June 2021, Juno made the next closest approach to the surface of this fascinating moon reaching a distance of 645 miles (1,038 km), detecting salts and organic compounds in its icy crust.

1. Galileo's view, June 1996
2. Juno's view, June 2021