We all know that a humongous black hole exists at the center of our galaxy. It's called Sagittarius A* (Sgr A* for short) and it has the mass of 4 million suns. We got to see a radio image of it a few weeks back, showing its accretion disk.
by astronomers at the University of North Carolina at Chapel Hill, there's a whole treasury of them out there.
Galaxy formation has its own hierarchical model, too. What creates one of those stellar cities? Galaxies like the Milky Way started out as a collection of gas in the early Universe. Their stars are what astronomers call"metal-poor" . And, these weird little galaxies swarm around some larger ones like fireflies. Sometimes they even get caught and swallowed up.
Small stellar-mass black holes could collide, particularly in crowded environments . Eventually, they form more-massive ones. Their data came from the Sloan Digital Sky Survey, plus the REsolved Spectroscopy of a Local VolumE and Environmental COntext Catalog .
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