Mercury has a molten core

Posted on Tuesday, May 08 2007 @ 09:28 CEST by Thomas De Maesschalck
Scientists who studied Mercury using Earth-based radio telescopes believe that the planet's metallic core is at least partially liquid:
Mercury, it seems, could have an electromagnetic dynamo—a phenomenon that occurs as Earth's molten, metallic outer core rotates around a solid inner core, spawning currents that generate a magnetic field.

The new study also indicates that an unknown element that formed beyond Mercury's orbit somehow got mixed into the planet's "batter" as it was forming billions of years ago.

"The prevailing notion is that a planet as small as Mercury would have cooled off and solidified a long time ago," said Jean-Luc Margot, the Cornell University planetary scientist who led the new study.

To stay liquid, Mercury's core must contain significant amounts of a light element—probably sulfur—that would lower the core's melting temperature, scientists say.

But during the solar system's birth, light elements condensed relatively far from the sun.

Small proto-planets moving through the system might have transported sulfur into Mercury's path while the planet was taking shape, Margot said.
More details at National Geographic.


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Thomas De Maesschalck

Thomas has been messing with computer since early childhood and firmly believes the Internet is the best thing since sliced bread. Enjoys playing with new tech, is fascinated by science, and passionate about financial markets. When not behind a computer, he can be found with running shoes on or lifting heavy weights in the weight room.



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