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However big that black hole is, it is dwarfed by the size of the Work is all done I’m going ah finally home nice cartoon shirt itself. That four million solar masses is a lot compared to our solar system, but it is absolutely puny compared to the total mass of the Milky Way, which is many tens of billions of solar masses. Galaxies are held together by self-gravity. They may or may not have a supermassive black hole (not all do). When that supermassive black hole is present, its gravity adds a modest contribution to the total self-gravity of the galaxy. But in all cases, even in the case of the largest black holes, the mass of the galaxy dominates over the mass of the black hole. Stars in a galaxy follow somewhat chaotic orbits, determined by the combined gravitational field of all other stars, clouds of gas, clouds of dust, and well, any black holes if present, supermassive or otherwise. But apart from stars that are relatively near the black hole in question, stuff in general does not orbit the black hole.

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A Welcome To Friendly Fayetteville Arkansas Shirt – though somewhat indirect and subtle – method used for stars that do not fit into these categories (which is the majority of them, at least in our own galaxy) is as follows: First deduce the likely temperature and size of the star from its dominant colour and the atomic spectra present in its light (temperature is related to colour, and different chemical elements are produced under different conditions of temperature and pressure, which in turn depend on the mass and age of a star). From these we can work out the likely luminosity. From the luminosity we can deduce the stars absolute magnitude [1] (i.e. how bright it would appear at a standard, fixed distance of 10 parsecs from us). Comparing this with the star’s apparent (i.e observed) magnitude, we can then calculate it’s actual distance from us. To me, this method of deducing a star’s distance from us merely by studying its light, and then doing a few calculations based on thermodynamics, nuclear physics, atomic physics and stellar dynamics, represents one of the most beautiful examples of the power of human ingenuity and careful, deductive reasoning in the history of science.

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