🔬 Science Sep 10, 2026 · Elizabeth Howell

Mercury may have shrunk much more than we thought, new study hints

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Mercury may have shrunk much more than we thought, new study hints
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Mercury, which is about one-third the size of Earth, may have shrunk more in its evolution than scientists originally thought.A new study suggests that the tiny planet may have contracted 10% to 30% more than previous models suggested — meaning the planet’s total diameter shrunk almost 12 miles (19 km) since Mercury was formed. (Mercury’s diameter today is roughly 3,032 miles (4,880 km). Previous missions overlooked the extent of the shrinkage because impact-crater debris on Mercury's surface hi

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