Mara Johnson-Groh

All Stories by Mara Johnson-Groh

  1. illustration of galaxy M81 next to a cluster of old stars

    A fast radio burst’s unlikely source may be a cluster of old stars

    The burst’s origin in a globular cluster suggests that not all these enigmatic blasts come from young stellar populations.

  2. illustration of a hypernova

    Souped-up supernovas may produce much of the universe’s heavy elements

    An old star that formed from an explosive event called a magnetorotational hypernova is revealing where elements like uranium and silver might be forged.

  3. illustration of fast radio burst from magnetic star

    Fast radio bursts could help solve the mystery of the universe’s expansion

    Astronomers used fast radio bursts for the first time to measure the Hubble constant in hopes of ending the debate on the universe’s expansion rate.