The inner core, the team found, also has a density of about 7,822 kilograms per cubic meter. That’s very close to the density of iron.
By Mpandashalo | Adapted.
Lusaka, May 7 – I came across this piece of information that I know will interest some of our followers!
A thorough investigation has found that the inner core of the Moon is, in fact, a solid ball with a density similar to that of iron. This, researchers hope, will help settle a long debate about whether the Moon’s inner heart is solid or molten, and lead to a more accurate understanding of the Moon’s history – and, by extension, that of the Solar System.
“Our results,” writes a team of astronomers of the French National Centre for Scientific Research in France, “question the evolution of the Moon’s magnetic field thanks to its demonstration of the existence of the inner core and support a global mantle overturn scenario that brings substantial insights on the timeline of the lunar bombardment in the first billion years of the Solar System.”
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Probing the interior composition of objects in the Solar System is most effectively accomplished through seismic data. The way acoustic waves generated by quakes move through and reflect from material inside a planet or moon can help scientists create a detailed map of the object’s interior.
We happen to have lunar seismic data collected by the Apollo mission, but its resolution is too low to accurately determine the inner core’s state. We know there is a fluid outer core, but what it encompasses remains under debate. Models of a solid inner core and an entirely fluid core work equally well with the Apollo data.
To figure it out once and for all, Briaud and his colleagues collected data from space missions and lunar laser ranging experiments to compile a profile of various lunar characteristics. These include the degree of its deformation by its gravitational interaction with Earth, the variation in its distance from Earth, and its density.
Next, they conducted modeling with various core types to find which matched most closely with the observational data.
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They made several interesting findings. Firstly, the models that most closely resembled what we know about the Moon describe active overturn deep inside the lunar mantle. This means that denser material inside the Moon falls towards the center, and less dense material rises upwards. This activity has long been proposed as a way of explaining the presence of certain elements in volcanic regions of the Moon. The team’s research adds another point in the “for” tally of evidence.
And they found that the lunar core is very similar to that of Earth – with an outer fluid layer and a solid inner core. According to their modeling, the outer core has a radius of about 362 kilometers, and the inner core has a radius of about 258 kilometers. That’s about 15 percent of the entire radius of the Moon.
The inner core, the team found, also has a density of about 7,822 kilograms per cubic meter. That’s very close to the density of iron.
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