Mercury May Have Shrunk Far More Than Scientists Realized—and Its Cratered Surface Was Hiding the Evidence

· Thedebrief · Sept. 14, 2026, 12:49 p.m.
space NASA astronomy Moon Mercury astronomy Planetary science Space Exploration
Summary
Recent findings suggest that Mercury has shrunk by as much as 30% more than previously believed, with its surface craters hiding this evidence of the planet's historical contractions.
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