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Scientific study of Mercury planetary contraction

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2026-09-13 23:25 UTC → 2026-09-14 21:15 UTC · added removed

Scientific research has revealed that the planet Mercury is shrinking at a rate significantly higher than previous models suggested. A study published in ‘Geophysical Research Letters’ indicates that the contraction rate may be 10% to 30% greater than earlier estimates, potentially resulting in a total diameter reduction of up to 23 kilometers (approximately 14.5 miles) since its formation 4.5 billion years ago. Researchers from the German Aerospace Center and Hokkaido University, led by planetary scientist Gaku Nishiyama, utilized data from NASA’s MESSENGER mission to reach these conclusions. The team found that previous estimates likely underestimated the shrinkage because impact debris from asteroids and comets, such as gravel and rubble, has obscured tectonic features like wrinkles, faults, and scarp structures. By comparing geological maps of these features with newer maps of surface roughness, scientists were able to account for these hidden signs of contraction. The accelerated shrinkage suggests that Mercury may have a larger metallic core, a higher initial temperature, or a lower concentration of light elements such as silicon. This contraction is driven by the cooling of Mercury’s interior over 4.5 billion years; as the core cools, the planet’s volume decreases, causing the crust to buckle and form ridges. As the joint European and Japanese BepiColombo spacecraft nears the end of its decade-long journey, approaches Mercury’s orbit, it is expected to enter Mercury’s orbit in November. This mission is anticipated to provide high-resolution data to further study the planet’s magnetic field, interior, and geological processes. Scientists anticipate that BepiColombo’s advanced laser instruments will provide precise laser measurements to confirm the extent of these findings. Having recently separated from its cruise stage, the planet’s contraction and mission is anticipated to offer deeper insights into its composition the planet’s magnetic field, interior, and geological history. processes.

Versions

  1. 2026-09-14 21:15 UTC Scientific study of Mercury planetary contraction
  2. 2026-09-13 23:25 UTC Scientific study of Mercury planetary contraction
  3. 2026-09-13 17:05 UTC Scientific study of Mercury planetary contraction
  4. 2026-09-12 17:24 UTC Scientific study of Mercury planetary contraction

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