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View submission: Ask Anything Wednesday - Engineering, Mathematics, Computer Science
They grow by absorbing matter and merging with each other. The discrepancy with the sun is time and location. Sagitarrius A*, the supermassive black hole at the centre of the galaxy, is, well, at the centre of the galaxy. It has lots of stars nearby to absorb (indeed, we can observe them directly and there are many that are *still* very close. (Like, some get closer than the distance between the sun and Uranus). It has had roughly 13.7 billion years to absorb other stars, whilst the Sun hasn't existed for that long, all while being in an unfashionable spiral arm.
There's nothing here!