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Home When the Moon had a magnetic field, it would have been shielded from incoming solar wind, as shown in this illustration. (NASA) When the Moon had a magnetic field, it would have been shielded from incoming solar wind, as shown in this illustration. (NASA)

When the Moon had a magnetic field, it would have been shielded from incoming solar wind, as shown in this illustration. (NASA)

When the Moon had a magnetic field, it would have been shielded from incoming solar wind, as shown in this illustration. (NASA)

When the Moon had a magnetic field, it would have been shielded from incoming solar wind, as shown in this illustration. (NASA)

The Earth and Moon, shown here in a composite of two images from the Galileo mission of the 1990s, have a long shared history. Billions of years ago, they had connected magnetic fields. (NASA/JPL/USGS)
This illustration shows how Earth and its Moon both had magnetic fields that were connected billions of years ago, helping to protect their atmospheres from streams of damaging solar particles, according to new research. (NASA)