Giant dying star explodes as scientists watch in real time — a first for astronomy

An artist's impression of a red supergiant star in the final year of its life emitting a tumultuous cloud of gas. This suggests at least some of these stars undergo significant internal changes before going supernova.

(CNN)The death of a star is one of the most dramatic and violent events in space -- and astronomers had an unprecedented front-row seat to the explosive end of a stellar giant.

Ground-based telescopes provided the first real-time look at the death throes of a red supergiant star. While these aren't the brightest or most massive stars, they are the largest in terms of volume.
One popular red supergiant star is Betelgeuse, which has captured interest due to its irregular dimming. While it was predicted that Betelgeuse may go supernova, it's still around.
    However, the star at the heart of this new research, located in the NGC 5731 galaxy about 120 million light-years away from Earth, was 10 times more massive than the sun before it exploded.
      Before they go out in a blaze of glory, some stars experience violent eruptions or release glowing hot layers of gas. Until astronomers witnessed this event, they believed that red supergiants were relatively quiet before exploding into a supernova or collapsing into a dense neutron star.
      Instead, scientists watched the star self-destruct in dramatic fashion before collapsing in a type II supernova. This star death is the rapid collapse and violent explosion of a massive star after it has burned through the hydrogen, helium and other elements in its core.
      All that remains is the star's iron, but iron can't fuse so the star will run out of energy. When that happens, the iron collapses and causes the supernova. A study detailing these findings published Thursday in The Astrophysical Journal.
        "This is a breakthrough in our understanding of what massive stars do moments before they die," said lead study author Wynn Jacobson-Galán, a National Science Foundation Graduate Research Fellow at University of California, Berkeley, in a statement.
        "Direct detection of pre-supernova activity in a red supergiant star has never been observed before in an ordinary type II supernova. For the first time, we watched a red supergiant star explode."
        This artist's impression shows a red supergiant star releasing a gas cloud in the final year of its life.

        The final moments of stellar death

        Astronomers were first alerted to the star's unusual activity 130 days before it went supernova. Bright radiation was detected in the summer of 2020 by the University of Hawaiʻi Institute for Astronomy Pan-STARRS telescope on Maui's Haleakalā.
        Then, in the fall of that year, the researchers witnessed a supernova in the same spot.
        They observed it using the W.M. Keck Observatory's Low Resolution Imaging Spectrometer on Maunakea, Hawai'i, and named the supernova 2020tlf. Their observations revealed that there was material around the star when it exploded -- the bright gas that the star violently kicked away from itself over the summer.