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

AI Thread Summary
The discussion centers on the size and mass required for a planet to possess a molten core or a magnetic field, emphasizing that factors such as composition, density, and formation play crucial roles. It suggests that there may not be a strict limit on size, but rather that the planet's characteristics and age are significant. The conversation references the magnetic fields of Neptune and Uranus, highlighting that their magnetic fields may originate from liquid layers rather than the core itself. The need for more data and samples to draw definitive conclusions is acknowledged. Overall, understanding the interplay of these factors is essential for determining planetary characteristics.
jarroe
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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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Age of the planet would factor in as well I am sure?
 

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