I haven't seen the movie yet but I read the book "Ender's Game" and was wondering about how a space station, with a sizable cube in the center maintained at null gravity was built. Then it occurred to me that the skin of such a place would be in tension like a balloon.
How much of Earth would have to survive an innitial alien attack to put such a training facility in space?
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A great troubleshooting tip...."When you eliminate the impossible, whatever remains, however improbable, must be the truth." Sir Arthur Conan Doyle
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