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We can calculate the mass of a galaxy by observing how fast stars are moving around...

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Physics

We can calculate the mass of a galaxy by observing how faststars are moving around its edge. Further we can estimate how manystars are in that galaxy using an average star mass of around 1/2solar mass. NGC 253 (image below) is a flat spiral galaxy with adiameter of about 60,000 ly. If a star on the edge of NGC 253 isobserved to have an angular velocity of about 7.8x10-16 rad/s, (a)calculate the mass of the galaxy and (b) estimate the number ofstars in it.

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4.4 Ratings (789 Votes)
aConsider there is a gravitational attraction between the galaxyand the star on the edgeThe radius of the galaxy isr 60 000 ly 6000 ly 946 x 1015 m 1ly 57 x 1018 mThe star moves    See Answer
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