they were only to exsist in the early universe, created from dark matter halos and hyrogen, they had a solar mass of 10000000 and a radius of 800000 suns, even so there exreme size isn't what special about them it's that they have a blackhole for a heart
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The core gets compressed by the star, turning into a black hole. The energy released by the black hole due to it being force-fed balances out stellar gravity, stabilising the star.
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The gravity from the halo compresses the hydrogen into a star, normally the star would sweep away the gas due to fusion energy therefore halting growth, but the halo keeps adding hydrogen to the star, growing it further.
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For context, dark matter halos are collections of dark matter, and they collected tons of hydrogen, more than regular nebulas
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You got this from Kurzgesagt, didn't you?