After more than 50 years, scientists finally confirmed that the moon has a solid inner core, just like Earth.
After more than 50 years, scientists have finally uncovered the moon's interior structure, showing that our closest celestial companion has a fluid outer core and a solid inner core, similar to Earth's. A team of researchers from the Côte d'Azur University and the Institute of Celestial Mechanics and Ephemeris Calculations in France detailed these findings May 3 in a study published in Nature .
The first hints that the moon had an Earth-like interior came from NASA's Apollo missions. Data gathered by the lunar landers' instruments suggested that the celestial body was differentiated — or layered with denser material at the center and less dense material nearer the surface — as opposed to uniform rock all the way through. Apollo astronauts even left seismometers on the moon, which later revealed that it experiences moonquakes, according to NASA .
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