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  1. Planetary Science

    G Whiz! Craft identifies source of faint Saturnian ring

    The Cassini spacecraft has discovered the source of particles that make up Saturn's G ring.

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  2. Earth

    Asian Forecast: Hazy, Warmer—Clouds of pollution heat lower atmosphere

    Clouds of smoke and soot that blanket many regions of Asia heat the lower atmosphere by the same amount that rising greenhouse gases do.

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  3. 19866

    Conservation by America is not going to decrease global warming. We need to imitate known global-cooling events, such as the Krakatoa volcano explosion, which spread sunlight-reflecting dust into the stratosphere in 1883. A hydrogen bomb exploded inside a ship full of white clay could be a first step.