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A huge forest native almost solely to elves who are widely regarded with hatred. What's to stop an army from simply burning the entire forest?
How discreetly can a small spacecraft crash land?
Surface is 500F (260 C), but we have thorium reactors, diggers and heat pumps so human life continues underground. Possible? Or slow-roast?
What would warfare look like on bodies the size of Ganymede to Europa?
Why should humans kill this space creature?
Is it possible to achieve space flight without having discovered crude oil?