"J. Scott Miller" ha scritto nel messaggio
...
It is not assumed that its gravitational pull will change. But, if a
black hole
is the power source for quasars, that black hole will be smaller than the
mass
distribution that led to its formation.

Since quasars are very old (high z = high distance) how so many
ultrapowerful black holes could be formed in the early ages of universe?
And why we don't have quasars with low z? Now we have a lot of black holes
formed in the last 13,7 billion years and some of these black holes could be
the power source of new quasars.

Or maybe I don't understand a thing of quasars?

Luigi Caselli