Massive asteroid impact may have shifted the axis of the largest moon in the solar system

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more Jupiter’s moon Ganymede may have shifted on its axis when a massive asteroid smashed into it about 4 billion years ago, according to a new study. Ganymede, the largest moon in the solar system, is even bigger than Mercury and the dwarf planet Pluto. And past research has found evidence suggesting that beneath its thick, icy crust lies a salty …