What is the mass of the Milky Way?

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We can consider the Sun to be a satellite of the Milky Way. The Sun revolves around the center of the Milky Way with a radius of 8 kpc. The period of revolution is 230 million years. What is the mass of the Milky Way?
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Why Is The Milky Way A Spiral?

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More than two-thirds of the galaxies are disc shaped. Most disc galaxies have spiral arms and are called spiral galaxies. Continue reading