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Dear Cecil: With the dearth of good real estate on Earth, I've been considering alternatives. One obvious candidate is Mars. However, in its current orbit, it's too nippy and the air is too thin to satisfy anyone except Sherpas. How much energy would it take to move Mars into Earth's orbit? Would it work better if we moved Venus instead because of its similar size to Earth? Please answer quickly as I need to finalize my retirement plans.
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