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  1. Planetary Science

    Dwarf planet Ceres may store underground brine that still gushes up today

    Waterlogged minerals and changing ice add to evidence that Ceres is geologically active.

    By Lisa Grossman
  2. Astronomy

    New Horizons’ next target has been dubbed Ultima Thule

    NASA has named New Horizons spacecraft’s next target Ultima Thule after the public suggested tens of thousands of monikers for the Kuiper Belt object.

    By Mike Denison
  3. Cosmology

    Renowned physicist Stephen Hawking dies at 76

    Beyond his research contributions, Stephen Hawking popularized black holes and the deep questions of the cosmos.

    By Emily Conover
  4. Planetary Science

    Cosmic dust may create Mars’ wispy clouds

    Magnesium left by passing comets seeds the clouds of Mars, a new study suggests.