Determine the mass of the galaxy (M) if, at a distance of r = 20 kpc from its core, the stars revolve with a velocity of v = 350 km / s.
| September 16, 2020 | Education
20 kpc = R ~ 2 * 10 ^ 4 * 30 ^ 11 * 180 * 3600 / 3.14 ~ 12.4 * 10 ^ 20 m. Hence M ~ 2.2 * 10 ^ 42 kg.
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