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"That," he said with animation, "is the Theory of the Sun Shield". - (Tarnsman of Gor, Chapter 2, Sentence #237)

In effect, the planet would have functioned as a gigantic sealed spacecraft. There was another possibility I mentioned to my father—perhaps the planet had been in our system all the time, but had been undiscovered, unlikely though that might be, given the thousands of years of study of the skies by men, from the shambling creatures of the Neander Valley to the brilliant intellects of Mount Wilson and Palomar. To my surprise, this absurd hypothesis was welcomed by my father. "That," he said with animation, "is the Theory of the Sun Shield". He added, "That is why I like to think of the planet as the Counter-Earth, not only because of its resemblance to our native world, but because, as a matter of fact, it is placed as a counterpoise to the Earth. It has the same plane of orbit and maintains its orbit in such a way as always to keep The Central Fire between it and its planetary sister, our Earth, even though this necessitates occasional adjustments in its speed of revolution". "But surely," I protested, "its existence could be discovered. - (Tarnsman of Gor)