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Cake day: July 15th, 2023

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  • Sorry, I was being cranky.

    Supermassive black holes (SMBs) are much, much bigger than any star. If you look at this Wikipedia article, you’ll see that the theoretical limit for star size is in the neighborhood of 300 times the mass of the sun. SMBs are at least hundreds of thousands of times more massive than the sun, up to billions of time more massive. They are also probably older than any star because they had to exist the form the seeds of galaxies. One of the open questions in astrophysics right now is how SMBs formed as quickly as they did, because there’s a limit on how quickly a black hole can absorb matter. Any faster than that limit, and the matter falling into the black hole is so hot and dense that a lot of it gets blown outward.

    If you find this stuff at all interesting, I recommend checking out PBS Space Time on YouTube, particularly their black hole episodes.