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A star near Discipal edge of a Galaxy travels in a uniform circular orbit it is 47,600 light ears from the Galactic center it has

A star near Discipal edge of a Galaxy travels in a uniform circular orbit it is 47,600 light ears from the Galactic center it has a speed of 275 km/s. The total visible mass of the galaxy is 10 to the 11th power solar masses. what fraction of the total mass of the galaxy is visible according to this estimate

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