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Astronomers have studied galaxy UGC 128 for many years. They have measured its brightness and calculated that the mass of stars within a radius of

Astronomers have studied galaxy UGC 128 for many years. They have measured its brightness and calculated that the mass of stars within a radius of 1.30 * 1021 m is 3.34 x 10"0 kg. Stars orbiting at this radius have been measured travelling at a speed of 1.30 * 105 m/s. What percentage of the mass within this radius is dark matter

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