A star, which is 2.0 x 1020 m from the center of a
galaxy, revolves around...
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A star, which is 2.0 x 1020 m from the center of agalaxy, revolves around that center once every 2.4 x 108years. Assuming each star in the galaxy has a mass equal to theSun's mass of 2.0 x 1030 kg, the stars are distributeduniformly in a sphere about the galactic center, and the star ofinterest is at the edge of that sphere, estimate the number ofstars in the galaxy.
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Answer Let us go to the basics first If the mass of the star is m then the total mass of the stars in the galaxy is Nm where N is the number of stars in the galaxy Assume that the
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