According to a new study from Japan’s Kobe University, this impact was so powerful that it shifted the moon's axis.
Roughly four billion years ago, a cataclysmic event shaped the largest moon in our solar system. This was the time when an asteroid smashed with Jupiter’s moon Ganymede.
Reportedly, these are thought to be the oldest features of Ganymede — resemble the scars of a massive impact that slammed early in the moon’s history. Some of these concentric rings span up to 7,800 kilometers across the surface. He added: “We know that this feature was created by an asteroid impact about 4 billion years ago, but we were unsure how big this impact was and what effect it had on the moon.”
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