# Scientific research on Mercury planetary evolution

> Live situation record from CLSTR: https://clstr.news/situations/scientific-research-on-mercury-planetary-evolution
> Updated: 2026-09-17T16:07:00.000Z. Sources: 11. Developments: 3.

Recent scientific research has provided new insights into the geological composition and evolutionary history of Mercury. One study led by the Max Planck Institute for Solar System Research indicates that the planet’s volcanic surface may contain significantly less silicon dioxide than previously estimated, with an abundance of approximately 37.4 percent by mass. This lower concentration suggests that Mercury’s ancient lavas may have originated from a hotter, more extensively melted mantle.

Complementary findings published in Geophysical Research Letters suggest that Mercury is shrinking up to 30 percent more than earlier estimates indicated. This contraction, evidenced by surface wrinkles and steep cliffs known as scarps, is attributed to the planet cooling over billions of years. Researchers suggest that this accelerated shrinking may imply a larger metal core, a higher initial temperature, or a lower concentration of light elements such as silicon within the core.

Building on these findings, research led by Gaku Nishiyama from the German Aerospace Center (DLR) and Hokkaido University suggests the planet may have lost up to 23 kilometers in diameter since its formation approximately 4.5 billion years ago. The study indicates that asteroid impact debris has likely obscured many geological signs of contraction in certain regions. By comparing tectonic structure maps with new roughness maps, the team found that irregular zones often lacked visible contraction signs because impact materials covered older structures. After correcting for these hidden features, researchers estimate a reduction in Mercury's radius of up to 11.6 kilometers, a finding that helps scientists refine models regarding the planet's temperature evolution and metallic core composition. Future observations from the BepiColombo mission are expected to provide further clarity on these small-scale tectonic features.

## Timeline

### 2026-09-17: Mercury contraction may be 30% higher than previously estimated

Researchers suggest Mercury has contracted 10% to 30% more than previously thought, potentially losing 23 kilometers in diameter as impact debris has hidden geological evidence of the planet's cooling.

6 sources. https://clstr.news/cluster/mercury-contraction-may-be-larger-than-previously-estimated

### 2026-09-14: Mercury shrinking up to 30% more than expected

A new study reveals Mercury is shrinking up to 30% more than expected, suggesting a larger metal core or higher initial temperatures than previously thought.

3 sources. https://clstr.news/cluster/mercury-shrinking-up-to-30-more-than-expected

### 2026-09-14: Mercury research suggests lower silicon dioxide levels and hotter mantle

New research indicates Mercury’s surface contains roughly 37% silicon dioxide, suggesting a hotter, more extensively melted mantle than previously thought.

2 sources. https://clstr.news/cluster/mercury-research-suggests-lower-silicon-dioxide-levels-and-hotter-mantle

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Cite as: Scientific research on Mercury planetary evolution. CLSTR, https://clstr.news/situations/scientific-research-on-mercury-planetary-evolution