“Well,” she replied, tapping on her keypad. “Heating Eros up didn’t move it. So I assume that means it was waste heat from whatever it was they actually did.” “And that means?” “That entropy still exists. That they can’t convert mass to energy with perfect efficiency. That their machines or processes or whatever they use to move seven thousand trillion kilos of rock wastes some energy. About a two-gigaton bomb’s worth of it.” “Ah.” “You couldn’t move Eros two hundred kilometers with a two-gigaton bomb,” Amos said with a snort. “No, you couldn’t,” Naomi replied. “This is just the leftovers.
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