Size/Mass of a planet needed in order to have a molten core or a magnetic field?

  • Thread starter jarroe
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  • #1
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How big does a planet have to be in order for it to have a molten core or a magnetic field? Assuming no other large objects were close enough to affect the planet with their own pull or magnetic field. I would imagine the composition/density of the planet would play a factor as well, but do we have any formulas out there that would descibe this. Perhaps we don't have enough samples/data to make an informed decision on this yet?
 

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  • #2
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Age of the planet would factor in as well Im sure?
 

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