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Conservation of Energy only applies in a closed system. If the rod is built on the Moon and then placed in Earth orbit it’s quite possible to be net positive energy relative to Earth’s gravity field.
Conservation of Energy only applies in a closed system. If the rod is built on the Moon and then placed in Earth orbit it’s quite possible to be net positive energy relative to Earth’s gravity field.
That is correct. But i am not aware of any Tungsten mines, let alone processing facilities on the moon within any foreseeable future.