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Worldbuilding

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  • $\begingroup$ The tropics are defined by Insolation, they're the area that receives direct(vertical) insolation for part or all of the year, they are not, in themselves, a biome of any kind. $\endgroup$
    – Ash
    Commented May 30 at 0:44
  • 1
    $\begingroup$ You have a bigger, colder world than Earth, so its ice caps will be bigger. There is no deterministic way to determine exactly how much bigger - notably because Earth's ice caps vary in size year to year. But even if we us median values... differences in atmospheric pressure, atmospheric composition, energy from the star, surface water (volume, salinity, surface area)... there's simply too many variables to give you an answer other than "bigger." $\endgroup$
    – JBH
    Commented May 30 at 3:19
  • $\begingroup$ Sorry, but if your planet will be larger than Earth and have a greater mass, its gravity will actually be stronger. One option is to simply omit the mass and say that your planet will be much less dense than Earth. $\endgroup$
    – MarcoMarksman
    Commented Jun 5 at 18:03