The Martian Sphinx

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Synopsis

By the twenty-first century the world was drowning in its own population. A solution had to be found quickly - and it was, in "gravipower." Wonderful, unending source of power - only the scientists knew that its use was reducing the Earth's distance from the sun at a dangerous rate. But if another planet's gravipower could be harnessed... An expedition was launched to Mars, known to be uninhabited - except that a woman was wandering around its surface who claimed she had come from another galxy to warn Earth of a terrible menace, and there was a huge polyhedron of metal emanating a force very much like that of gravipower. Someone else had discovered it! A thousand years ago, or now? Friend, or enemy?