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  1. Astronomy

    Betelgeuse’s companion star revealed in new images

    Revealed by advanced imaging, the long-sought "Betelbuddy" is much smaller and fainter than Betelgeuse and orbits within the supergiant’s atmosphere.

    By Mara Johnson-Groh
  2. Life

    This killer fungus strikes at sunset. Here’s how

    The fungus Entomophthora muscae turns flies into zombies and kills them at sunset. An internal kill clock may explain the mysterious timing.

    By Meghan Rosen
  3. Health & Medicine

    Here’s how air pollution may trigger lung cancer

    Exposure to air pollution may trigger DNA mutations that cause lung cancer in nonsmokers.

    By Meghan Rosen

  4. A summer of escalating existential threats

    Editor in Chief Nancy Shute reflects on the renewed specter of nuclear conflict to record-breaking heat driven by human-caused climate change.