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Why do planets have magnetic fields?

29 Apr 2018, 06:00 UTC
Why do planets have magnetic fields? NASA-GSFC Scientific Visualization Studio / JPL / NAIF

Planetary magnetic fields are produced by churning motions of liquids at a planet’s core that conduct electricity and have an electric charge. The magnetic fields act like giant bar magnets and can be offset from the rotation axis of a planet. For example, the Earth’s magnetic field is tilted about 11 degrees to the axis of rotation.

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