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  1. Planetary Science

    Saturn’s icy rings are probably heating its atmosphere, giving it an ultraviolet glow

    Detecting similar emission from a distant world could help astronomers find other planets that boast bright and beautiful rings.

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  2. Earth

    The Great Salt Lake is shrinking. What can we do to stop it?

    A dropping lake level affects agriculture, public health and the environment — but water conservation can halt the decline.

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  3. Readers react to a dwarf planet’s odd ring, dry farming and more

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  4. Tech

    50 years ago, a balloon circumnavigated the world for science

    A 1973 high-altitude flight kicked off an era of useful stratospheric balloon science.