Re: Cidri Genesis
250,000 mi^2 land plus equal water gives 12615 miles radius (Earth is 3,959 mi)
Total mass to get to 1 G is 10.15 Earth masses over 32.3 Earth volumes which is mostly ice or water. Fixing density to the same as Earth gives 2/3rs hollow. That's around 2000 miles thick.
10,000 mile radius swinging around in 24 hours gives 1% of a G at the inner equator. I suggest using some magic here.
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