Scientists are certain that there are massive black holes at the center of each galaxy. By observing star movements around the centre of our galaxy, they can deduce the mass of the object that they are orbiting. There is no way as far as we know that something with 2 billion solar masses can exist and not be illuminated, unless it's a black hole.
The process of stellar evolution will pretty much guarantee supernovas, pulsars, neutron stars and black holes. I don't pretend to be an expert, and I can't remember the entirety of the technical arguments. Black holes fit in with galaxy evolution too it seems, at least according to the most recent research. Scientists now think that black holes come first, followed by galaxy evolution. Maybe in those very first instants after the big bang, physics was different, and ultra massive stars with billions of masses could develop. The larger a star, the shorter its lifespan..
Dave
Quote:
Originally Posted by sjastro
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