A new study has revealed that Mercury, the smallest planet in the solar system, is shrinking at a much faster rate than previously believed, opening an unprecedented window into understanding the planet's formation, history, and evolution.
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According to the New York Post, the study's team said that "although this planet has been shrinking for 4.5 billion years, a result of the cooling process that followed its fiery formation, the rate of this shrinkage may exceed previous estimates by 30 percent."
The study indicates the planet's shrinkage may amount to about 22 kilometers, a significant figure compared to Mercury's diameter of only about 4,800 kilometers.
Lead researcher Gaku Nishiyama, a planetary scientist at the Institute of Planetary Research at the German Aerospace Center, said: "We're getting closer to understanding the true story of Mercury's evolution."
The researchers relied on data collected by NASA's MESSENGER spacecraft, which spent more than 4 years orbiting the scorching planet, mapping its surface terrain and searching for geological features known as "contraction structures."
These formations appear on the planet's surface as it shrinks, closely resembling the wrinkles that form with aging. Studying these markings, however, proved difficult, since many of them are covered by craters and debris from impacts caused by asteroids and other celestial bodies.
To overcome this challenge, the researchers gathered two-dimensional images captured by the spacecraft's imaging systems, then combined them to create highly detailed maps of Mercury's surface terrain.
The results revealed far more shrinkage markers than previous estimates, suggesting the planet has lost size at a faster rate than scientists had believed.
Researchers believe tracking this shrinkage could help reveal what's happening beneath Mercury's rocky crust, and could also provide important insights for understanding the shrinkage and internal changes that may occur in other planets.
Recourse: Al-Ghad.
