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Mercury Shrunk More Than We Thought!
10 Sep
Summary
- Mercury's surface shows evidence of significant shrinkage.
- New study suggests Mercury contracted 10-30% more than estimated.
- Impact debris may have masked the true extent of Mercury's contraction.
New research suggests that Mercury, the planet closest to the sun, has shrunk considerably more than scientists had previously estimated. The planet's surface features, such as cliffs and ridges, indicate a significant contraction event.
Researchers analyzed data from the MESSENGER mission, mapping surface roughness and identifying fewer contraction wrinkles in rougher areas. This led them to hypothesize that debris from billions of years of impacts may have obscured many of these telltale signs of shrinkage.
The study estimates that Mercury's radius may have changed by approximately 7.2 miles (11.6 kilometers), a shrinkage rate 10% to 30% greater than earlier calculations. Previous estimates suggested a radius change between 0.6 to 1.2 miles (1 to 2 kilometers) and up to 4.3 miles (7 kilometers).
This finding could offer crucial insights into Mercury's internal structure, its core composition, and its geological history. Understanding how much Mercury has shrunk is key to deciphering its formation and evolution. The upcoming BepiColombo mission, set to release two orbiters around Mercury in November, is expected to provide more detailed topographic data. This data will help scientists refine estimates of Mercury's contraction and test the findings of this latest study.
