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Saturn, Uranus and Neptune all have water in their atmospheres, new measurements show. Water hasn't been found before in these giant planets, whose atmospheres are made mostly of hydrogen, helium and methane. But an international team of astronomers recently used an infrared telescope in space to detect small amounts of water in the planets' upper atmospheres.

The results suggest that tiny icy particles from the outer solar system may be hitting Saturn, Uranus and Neptune and leaving their water behind, the scientists wrote recently in Nature.

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