Mercury Shrinking Faster Than Expected, New Study Reveals

New study shows Mercury is shrinking faster than scientists thought, with potential implications for understanding other planets. Discover the latest findings.

Editorial Desk

September 10, 2026 One Min Read

POLICY WIRE — CAPE CANAVERAL, Fla. — A new study reveals that Mercury, the smallest planet in our solar system, is shrinking at a faster rate than previously believed, according to researchers from the German Aerospace Center’s Institute of Space Research.

The findings suggest that Mercury’s diameter could be decreasing by as much as 14 miles (23 kilometers), a loss that could have significant implications for planetary science. The research comes as the European and Japanese spacecraft BepiColombo prepares to enter orbit around Mercury later this year.

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Scientists used data from NASA’s Messenger mission and compared it with newer surface maps to estimate the extent of Mercury’s shrinkage. The results could help better understand how other planets evolve over time. Researchers are excited about the potential insights this discovery could provide into planetary contraction.

Reporting by Policy-Wire (PW)

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