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In Doom, Phobos is depicted with Earth-like gravity, a thick atmosphere, and tall, seemingly vegetation-covered mountains; the sky texture for the episode was derived from a photograph  taken of Yangshuo Cavern in China. In reality, Phobos is a rock 20 kilometers in diameter with gravity less than a thousandth of that on Earth, and no atmosphere (even if an atmosphere could be generated artificially, the moon's gravity would be insufficient to hold it in place). To be more plausible, Doom 3 moved the plot to Mars.