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  1. Astronomy

    New Images: They Might Be Planets

    Astronomers have for the first time obtained images of as many as 18 objects beyond our solar system that, based on their mass alone, could qualify as planets.

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  2. Math

    Extreme Tides

    If Earth had been somewhat larger, it’s possible that it would not have survived tides induced by its moon or even by an encounter with a passing asteroid. That’s one scenario suggested by a recent investigation of a venerable equation that serves as a model for planetary tidal effects. Tidal effects are caused by the […]

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  3. Humans

    Letters

    Letters from the Jan. 17, 2004, issue of Science News.