Mercury's surface is riddled with wrinkles, evidence of a once-larger planet that has shrunk over time. A new study finds that Mercury may have contracted 10% to 30% more than previously thought—a loss of nearly 12 miles (19 kilometers) of total diameter since the planet formed—due to debris fro...

Source: [Phys.org](https://phys.org/news/2026-09-mercury-thought.html)

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