New simulations show that Jupiter's massive moon Ganymede was knocked off its axis when it was struck by a roughly 90-mile-wide asteroid around 4 billion years ago. The colossal collision was likely one of the biggest asteroid impacts the solar system has ever seen.

A new study revealed that a massive asteroid may have hit Jupiter’s moon Ganymede about 4 billion years ago, shifting the moon on its axis.

T he asteroid collision that killed the dinosaurs 65 million years ago may have been a major cosmic crack-up, but it was nothing compared to a bigger impact that occurred roughly four billion years earlier,

Jupiter's moon Ganymede was hit by an asteroid about 4 billion years ago that was so large the moon's axis shifted as a result, study finds.

One researcher thinks the asteroid, which is thought to have hit Ganymede 4 billion years ago, was 20 times larger than the one that wiped out Earth's dinosaurs.