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Assume you have a 1kg squirrel
E=mc^2
E=1kg(3x10^8m/s)^2=9x10^16J
which, if I'm not mistaken, is equivilent to roughly a 50 megaton nuclear bomb.
Fear the squirrel.
Maybe it has something to do with the hard code, not allowing the Ships to occupy the same space as a planet square....? Is ramming turned on or off on the settings?
Just a guess or two....