Ancient asteroid impact shifted Ganymede’s axis by 7 degrees, changing its geological history

A massive asteroid struck Ganymede, Jupiter’s and the Solar System’s largest moon, roughly 4 billion years ago, producing a significant shift in its rotational axis. This event, which formed the conspicuous Valhalla Basin, was so powerful that it shifted Ganymede’s axis about 7 degrees, changing the moon’s geological history.

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