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  1. Space

    Astronomers have found the edge of the Milky Way at last

    Computer simulations and observations of nearby galaxies let astrophysicists put a firm number on the Milky Way's size.

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  2. Readers weigh in on coronavirus, cats and more

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  3. When coronavirus is both work and worry

    Our editor in chief Nancy Shute discusses what it's like to cover the current coronavirus pandemic.

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  4. Health & Medicine

    Why some heart patients may be especially vulnerable to COVID-19

    Researchers don’t yet know if the way the coronavirus enters cells may have something to do with the risks to the heart.