DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Earth-like alien planet. Computer illustration of a view across the frozen surface of an alien planet towards an Earth-like planet (upper right) and its star on the horizon. 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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