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Why Does Mercury, the Smallest Planet in the Solar System, Shrink so Much?

Summary by Génération-NT
Mercury, the smallest planet in our solar system, has narrowed by 30% more than scientists thought so far. By cooling, its imposing iron core has contracted, erasing up to 23 kilometres of its global diameter. This discovery completely redraws our understanding of the evolution of the rocky worlds.
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4 Articles

The contraction of the smallest planet in the solar system is a natural phenomenon, but a study reveals that the process is 30% faster than astronomers calculated

The smallest planet in the Solar System could have shrunk more than was believed throughout its history. Scientists now estimate that Mercury could have lost up to 23 kilometers in diameter since its formation.According to a new study, the planet Mercury has lost approximately 23 kilometers in diameter since its formation.Mercury, known as the smallest planet in the Solar System, has shrunk more than scientists had estimated. A new study by the …

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Studies revealed that the wrinkled planet has contracted between 10 and 30 by La entrada Mercury is shrinking: what does it mean for science to happen to the planet closest to the sun was first published in Research and Development.

Mercury, the smallest planet in our solar system, has narrowed by 30% more than scientists thought so far. By cooling, its imposing iron core has contracted, erasing up to 23 kilometres of its global diameter. This discovery completely redraws our understanding of the evolution of the rocky worlds.

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Génération-NT broke the news on Saturday, September 19, 2026.
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