New data collected from sensors left on moon in 1971 Moon has liquid core just like Earth

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Core knowledge: Nasa applied contemporary seismological techniques to data being emitted from sensors left on the Moon in 1971. Scientists now think the Moon has a solid, iron-rich inner core and a fluid, primarily liquid-iron outer core
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Moon has liquid core just like Earth... reveal sensors left on lunar surface by astronauts 40 YEARS ago

By Graham Smith 7th January 2011

It's an unlikely marriage between state-of-the-art and 40-year-old technology that has yielded extraordinary results.
Signals from seismic sensors left on the lunar surface by Apollo astronauts in 1971 have revealed that the Moon has a liquid core similar to Earth's.
Scientists at Nasa applied contemporary seismological techniques to the data being emitted from sensors placed by their colleagues during the U.S. space program's heyday.

The new research suggests the Moon possesses a solid, iron-rich inner core with a radius of nearly 150 miles and a fluid, primarily liquid-iron outer core with a radius of roughly 205 miles.
Where it differs from Earth is a partially molten boundary layer around the core estimated to have a radius of nearly 300 miles.
The data sheds light on the evolution of a lunar dynamo - a natural process by which our Moon may have generated and maintained its own strong magnetic field.

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