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  • BBC Sky at Night

    Q&A WITH A GALAXY EVOLUTION SCIENTIST

    May 19, 2022 2 minutes

    Melissa Brobby interviews Joanna Piotrowska

    How are supermassive black holes in the centres of galaxies preventing the birth of new stars?

    When gas falls onto a supermassive black hole, it settles into an accretion disc due to the angular momentum present in the system. Matter in these accretion discs becomes hot, reaching temperatures of above one million degrees Centigrade. This hot gas emits high-energy

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