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Interesting facts about the Universe | Why does Mercury still have a magnetic field?

Watch the new series of Mercury after the Jupiter and Mars series.

Mercury has a magnetic field due to its molten iron core acting as a giant dynamo. The planet Mars doesn’t have a magnetic field as its core has cooled and is no longer in a molten state. Objects with less mass cool more quickly.

Mars is twice as massive as Mercury. Despite this Mercury still has a molten core. Why? Write your answer in the comments and see if you're right. If you're not, I will write the correct answer. :-)

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