Asteroid twice the size of Chicago spun Jupiter's moon around, made gravity anomaly
Just like the Earth's moon, Ganymede is tidally locked ... Now, let's put the size of that asteroid into perspective. The ...
ZME Science on MSN5mon
Colossal Asteroid, 20 Times the Size of Dinosaur-Killer, Struck Solar System’s Largest Moon 4 Billion Years Ago
This kind of event, known as true polar wander, is rare—and impressive. Ganymede, like Earth’s moon, is tidally locked, which ...