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Earth-like alien planet and nebula
Earth-like alien planet and nebula. Computer illustration of a view across the rocky surface of an alien planet towards an Earth-like planet (right) on the horizon and the star-forming clouds of gas and dust of nebula in the background. Earth-like planets capable of supporting life are found only in a star's habitable zone, a region around a star where the surface temperature of a planet is suitable for liquid water.
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