A recent study suggests that Mercury is shrinking at a faster rate than previously thought, with researchers estimating a potential loss in diameter up to 30% greater than previously believed. That’s a potential loss in diameter of up to 14 miles.
Why is that important? Researchers believe that understanding Mercury’s shrinkage could provide insights into the evolution of other contracting worlds in our solar system.
Scientists believe that “roughness bias”—where asteroid debris and impact craters conceal surface tectonic wrinkles—may also affect their calculations for other shrinking terrestrial bodies in our solar system, such as Earth’s Moon, which experiences its own moonquakes and contraction.
“Understandably, scientists find that studying the first rock from the Sun is no easy feat, as the blinding light from our home star obscures the entity. It’s also the second-hottest planet after Venus, reaching temperatures of 800 degrees Fahrenheit during the day,” the New York Post reported.
“The rough surface of Mercury, continually reshaped by impact craters, may have obscured scientists’ understanding of the true extent of the planet’s shrinkage. As its heavy iron core cools, the entire planet shrinks, like a grape transforming into a raisin in the sun. Its outer crust buckles and cracks around it, but on a planet scale, those surface wrinkles translate into huge cliffs and mountainous ridges,” Mashable explained.
Scientists attribute Mercury’s shrinkage to the cooling and contraction of its hot iron core, mantle, and crust, which causes the planet to tighten like a girdle over its 4.5 billion-year history.
BepiColombo, a pair of European and Japanese spacecraft, is expected to enter orbit around Mercury in November and will use a laser instrument to confirm the extent of Mercury’s shrinkage due to internal cooling.
And whatever researchers find could have implications for other celestial bodies. “This roughness bias may also be critical for other terrestrial bodies like the Moon,” they wrote.
Content contributed by audacy staff member, reported from Berlin, Germany, sourced by audacy.com
