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Galaxy evolution
Suppose a normal galaxy like ours.
Heavy stars are produced by the galaxy, converting cold gas into black holes or heavy neutron stars. Supernova explosions aren't symmetric, most stars receive a "kick" when transforming into a black hole or a neutron star. The resulting vector (that I would assume has random components), has sometimes a component in the direction of the doomed star's orbit, or a direction against its orbit. If it is in the direction of its orbit around the galaxy center, the star has a constant velocity away from the center, it will move away from the center until the galaxy's gravitational tug retains it. If its in the direction against its orbit, the star will spiral into the center of the galaxy. As eons pass, the dead stars accumulate either at the center of the galaxy or in a diffuse halo of invisible matter around the galaxy. This invisible mass can't explain the sorely needed black matter? Recently, a population of black holes has been detected at the center of our galaxy. Columbia University. "Tens of thousands of black holes may exist in Milky Way's center." ScienceDaily. ScienceDaily, 4 April 2018. www.sciencedaily.com/releases/2018/04/180404133532.htm. Couldn't a symmetrical population of dead and invisible halo stars make for the modified gravity we see? As more and more gas is processed into dead stars (a fast process, since huge stars live a short life) these populations grow and grow, without any limit. Trees are always growing. Dead cells make for their rigidity... [[Mod. note -- These black holes are more massive than most stars, so dynamical friction ( https://en.wikipedia.org/wiki/Dynami...uitive_account ) causes them to gradually sink towards the center of the galaxy. This means that there may be a high density of black holes near the center of the galaxy. But, because these black holes are concentrated at the center of the galactic, they can't explain flat galaxy rotation curves. To explain those (without MOND) dark matter must be widely distributed throughout the galaxy. -- jt]] |
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