The exo-planet Kepler-10c has a mass between 15 and 19 times the mass of the Earth (making it comparable in mass to Neptune), and yet is thought to have a density of about 7g/cm^3 and to be a terrestrial planet, with a substantial proportion of "hot ice"
Is there an upper limit to the mass of terrestrial planets, or can rocky planets form that are larger than Kepler-10c?
This, older, article in Universe Today suggests that terrestrial planets can't form more than 5-10 Earth Masses, substantially smaller than Kepler 10c.
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