Discussion
Which planet in the solar system has the strongest magnetic field?
Answer: D
Correct answer: Jupiter
Jupiter’s magnetic field is about twenty thousand times stronger than the Earth’s and is by far the largest structure in the solar system after the Sun’s own heliosphere - if its magnetosphere were visible from Earth it would appear several times the width of the full Moon. The field is generated by a dynamo in a deep layer of metallic hydrogen, hydrogen compressed so hard by the planet’s gravity that it conducts electricity like a metal. Rapid rotation, under ten hours, drives the dynamo hard. Its radiation belts are correspondingly fierce, intense enough to damage spacecraft electronics, which is why probes such as Juno fly highly elliptical orbits that limit their time in the worst of it. Saturn has a similar but weaker field, Neptune’s is oddly tilted and offset from its centre, and Earth’s is the weakest of the four.
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