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PASADENA, Calif. (AP) — In a surprise finding, scientists say they have shown in the first experiments to date that the moon itself has a tiny magnetic field, similar to Earth’s. The research published in the journal Nature this week is significant because it shows that large celestial bodies such as the Earth, sun and moon must have magnetic fields for their planets to be made of the same material as the Earth.

PASADENA, Calif. (The Associated Press) — In a first experiments to date to show that the moon itself has a tiny magnetic field, scientists say they have shown in the first experiments to date to show that the moon itself has a tiny magnetic field, similar to Earth’s. The research published in the journal Nature this week is significant because it shows that large celestial bodies such as the Earth, sun and moon must have magnetic fields for their planets to be made of the same material as the Earth.


The field, which can be observed from Earth because of its gravity, can be used to estimate the size and mass of the moon, making it possible for scientists to make some inferences about the composition of the interior of the moon, which are difficult using only moon rocks or spacecraft measurements.

“Scientists have been making assumptions about the strength of the magnetic field, and now we’ve found compelling evidence that it exists,” said NASA spokesman David Sturdivant.

The new findings were made by looking at two kinds of lunar samples collected by NASA’s Lunar Reconnaissance Orbiter. One sample — part of the surface rock — was taken in 2000, when the moon had a new moon. Another sample was taken in 2005 — at a different phase of the moon.

Scientists initially did not think the magnetic fields would be as strong as in Earth’s case. They found that magnetic fields must be strong if the Moon is in orbit around a planet and is similar to a planet. To get the measurements, scientists used an instrument called the magnetic polarimetric laser interferometer, which is much more sensitive than current instruments.

For the new experiment, the scientists used the high energy laser to excite a material called an iron-nickel-magnesium oxide. This creates a magnetic field and allows scientists to determine its internal structure.

In addition to being in the lunar

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