Mercury’s surface reveals a surprisingly fiery past
New analysis of Mercury's surface reveals a significantly lower concentration of silicon dioxide than previously estimated. This suggests the planet's volcanic history involved deeper mantle melting than scientists originally theorized.
Why it matters
Refining the chemical composition of Mercury provides essential data for understanding the formation and geological evolution of terrestrial planets in our solar system.
Mercury and Earth followed very different paths after they formed. Mercury, the smallest planet and the one closest to the Sun, appears to have cooled relatively quickly. Roughly one billion years after its formation, volcanic activity may already have largely stopped, leaving the planet covered by a solid, continuous rocky crust.
Earth never reached that same state. Its crust remains geologically active, with volcanoes and plate tectonics continuously reshaping the planet. Mercury, by contrast, has been largely frozen in place for billions of years. Scientists are still working to understand exactly how its volcanic history unfolded and how those early processes produced the world we see today.
One of the best ways to investigate that history is by studying the chemical makeup of Mercury's surface.
Mercury Has Less Silicon Dioxide Than Expected
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