The inner aqueous core is a solid metal



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Mercury image based on Mercury messenger data [NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington 제공]

Description of the imageMercury image based on Mercury messenger data [NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington 제공]

Confirmation based on gravity and rotation measurement data of a water-based probe

Mercury, the planet closest to the Sun, has been found to have a solid inner core similar in size to Earth.

According to the American Geophysical Society (AGU), a team led by Antonio Genoa, a professor at the University of Rome, Sapienza University, confirmed the nuclear structure based on the water rotation and gravity data measured by MESSENGER, published in the journal Geophysical Research Letters .

NASA's second water-based probe, Messenger, began its mission in March around Mercury in March 2011 and fell on the surface of the water in April 2015 to lower its altitude until shortly before being oxidized. .

Mercury has metallic nuclei like Earth, but 85% of the planets have a unique structure with nuclei.

Among them, the outer core was found to consist of metallic fluids, but there was no confirmation, only an estimate of the inner core being solid. Assistant researchers from Genoa have found clues about this in their Messenger observations about the rotation and gravity of Mercury.

All the planets revolve around their poles, and the rotation cycle of Mercury is much slower than the Earth, reaching about 58 days. These tiny changes in rotation provide a glimpse of the interior of the planet. In 2007, changes in the observed aqueous magnetic flux showed that the nucleus is fluid.

The internal nuclear structure of Mercury, which is confirmed as similar to Earth. [Antonio Genova 제공]

Description of the imageThe internal nuclear structure of Mercury, which is confirmed as similar to Earth. [Antonio Genova 제공]

However, there was a limitation in confirming the structure of the core only by changing the magnetic flux of the water, and was aided by gravity measures influenced by the internal density.

The messenger lowers its altitude gradually as it orbits its orbit, measuring how much it accelerates under the influence of gravity. The Messenger lowers the altitude to 104 km before hitting the surface of the water, ensuring valuable data that can not be obtained from Earth observations.

The researchers confirmed Mercury's internal structure by inserting messenger measurement data into an advanced computer program. As a result, Mercury's inner core is about 2,000 km wide and occupies half the entire core (about 4000 km) respectively.

It is similar to the inner core of the Earth, about 2,400 kilometers long.

However, the inner core of the Earth is slightly larger than a third of the total nuclei, so there is a difference in proportion.

A co-author, NASA planet Goddard Space Flight Center scientist Erwan Mazarrico said in a statement that "information has been collected in various fields to reveal the internal hydrological structure of geodesy, geochemistry, orbital dynamics and gravity." .

The researchers found that it would not be possible to obtain data on the rotation and gravity that were used to identify the internal aqueous structure by observing only the Earth, "he said.

The researchers also added that new observations could be made by the meteorological observations of the messenger, which could broaden their understanding of water.

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