If there are supermassive black holes at the center of most galaxies, why are there not massive stars at the center of galaxies as well?
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Along with previous answers:
The larger a star is, the faster it will burn through its fuel. Basically the bigger it is, the shorter it lives.
Our sun is a relatively small star compared to some of the giants. It will “live” for approx. 10 billions years. Current age is approx 4.5 billion years.
The universe is currently estimated to be approx. 13.8 billion years, depending on the study you look at.
Super massive stars only live for tens or hundreds of millions of years. If they are large enough, the end process of their life will result in a supernova that leaves behind a black hole. So even if the core area started with a cluster of large stars, they would have quickly (astronomically speaking) burned out and created black holes.
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