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  1. Planetary Science

    Oxygen-rich exoplanets may be geologically active

    Experiments show that rocks exposed to higher concentrations of oxygen have a lower melting temperature than rocks exposed to lower amounts.

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  2. Readers ask about the moon’s slow escape from Earth and more

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  3. Animals

    Here’s what goldfish driving ‘cars’ tell us about navigation

    When measuring intelligence, the saying goes, don’t judge a fish by its ability to climb a tree. But what about its ability to drive a vehicle?

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  4. Science explores the nature of time and space

    Editor in chief Nancy Shute discusses how science tries to make sense of time and space.