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Brandon Sanderson / Re: Timespan for Stormlight Archives? (Spoilers)
« on: August 22, 2011, 04:24:35 PM »It doesn't matter if it's the same size, bigger, or smaller than Earth. If it takes 20 hours to rotate, then it has a 20 hour day.
Let's use Mars and Mercury as examples:
Mars has a 24.6229 hour day and is only has 11% of Earth's mass. Mercury has a 1407.5 hour day and has about the same mass as Mars. Mercury has nearly the same density of Earth. Mar's radius is 0.533 Earths, and Mercury's radius is 0.3829 Earths.
The mass only matters for gravity.
Actually, Mars has twice the mass of Mercury. Yet at the same time, they both have almost the same surface gravity! Density of the planet also plays a role and can have significant impacts apparently. Source of all my apparent smartness: http://en.wikipedia.org/wiki/List_of_gravitationally_rounded_objects_of_the_Solar_System
The things I learn on this forum...