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

  1. Jul 14, 2012 #1
    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?
  2. jcsd
  3. Jul 14, 2012 #2
    Age of the planet would factor in as well Im sure?
  4. Jul 15, 2012 #3


    Staff: Mentor

  5. Jul 19, 2012 #4
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