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  1. Physics

    50 years ago, timekeepers deployed the newly invented leap second

    After more than 50 years, metrologists will stop using the leap second to align the time kept by atomic clocks with the rate of Earth’s spin.

    By Cassie Martin
  2. Space

    Astronomers have snapped a new photo of the black hole in galaxy M87

    The Event Horizon Telescope image shows material around the black hole has moved, but other aspects remain the same, proving Einstein is right again.

    By Adam Mann
  3. Astronomy

    Astronomers are puzzled over an enigmatic companion to a pulsar

    The strange entity has a mass between that of a neutron star and a black hole.