Tytower obviously missed Allover's post of the same black hole.
This black hole is ~20 billion solar masses @ ~2 billion years old.
Ton618 is ~60 billion solar masses @ ~4 billion years old.
S5 0014+81 ~40 billion solar masses @ ~4 billion years old.
H1821+643 ~30 billion solar masses @ ~10 billion years old.
H1821+643 ~20 billion solar masses @ ~13 billion years old.
So while this is only a very small sample size, there is a general trend in quasar (black hole) sizes. The big ones are really far away, in the early universe.
There are a lot more smaller supermassive black holes closer (later) in the universe.
The obvious question is how such black holes can get so big so fast?
The less obvious is why there aren't any that big in the universe now?
Most nearby quasar and SMBH's are about 1 billion solar masses.
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