Black hole sun
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Speculation: these objects may help explain why JWST is finding galaxies much further along in development than we expected early on in the universe.
Were these monsters only possibile in the early universe?
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Yes. There are a ton of factors at play, but the universe was quite a bit different early on. The cores would collapse into a black hole, but the star was still so big that the outer parts become a sort of cocoon around the black hole.
They aren't really "stars" since the core (a black hole) isn't doing fusion, but they would appear very star-like if you hung out near one.
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