The planet Mercury is shrinking far faster than we thought

Scientists have discovered that Mercury, the planet closest to the sun, has shrunk more than previously thought. As Mercury cools, its surface forms hills and ridges, known as shortening structures. New research indicates that these features are more numerous than scientists realized, suggesting the planet has contracted by up to 23 kilometers, much more than earlier estimates. This finding provides fresh insights into Mercury’s evolution and internal structure. Studying Mercury is challenging due to its proximity to the sun, making it hard to observe from Earth or send spacecraft. Researchers rely on satellite data to understand its history. The study highlights the impact of surface roughness from meteor impacts on Mercury’s geological history. Understanding these changes helps scientists learn more about the planet’s thermal evolution and what lies beneath its surface. QUESTION: How might learning more about Mercury’s shrinking affect our understanding of other planets in our solar system?