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Scientific study of Mercury planetary contraction

Overview

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 approaches Mercury’s orbit, it is expected to provide high-resolution data and precise laser measurements to confirm these findings. Having recently separated from its cruise stage, the mission is anticipated to offer deeper insights into the planet’s magnetic field, interior, and geological processes.

Entities

Gaku Nishiyama · NASA · Mercury · BepiColombo · German Aerospace Center

Timeline

  1. 10 days ago

    [TECHNOLOGY] 14 sources
    Mercury is shrinking faster than previously estimated

    A new study reveals Mercury is shrinking up to 30% faster than previously thought, with its diameter reduced by as much as 23 kilometers due to internal cooling and obscured tectonic structures.

  2. 12 days ago

    [TECHNOLOGY] 42 sources
    Mercury shrinking faster than scientists previously estimated

    A new study reveals Mercury is shrinking 10% to 30% faster than previously thought, potentially losing up to 23 kilometers in diameter due to its cooling metallic core.

Sources

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This summary has been updated 3 times: see revision history