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Habitable zone planets, illustration
Habitable zone planets. Computer illustration showing the relative sizes of habitable zone planets detected by NASA's Kepler space telescope, compared to Earth (far left). From left to right: Earth, Kepler-62f, Kepler-62e, Kepler-69c, Kepler-22b. The habitable zone is the region around a star where liquid water, an essential ingredient for life as we know it, could potentially be present.
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