Our Sun is 2.3 104 ly (light-years) from the center of our Milky Way galaxy and is
Chapter 10, Problem 92(choose chapter or problem)
Our Sun is 2.3 104 ly (light-years) from the center of our Milky Way galaxy and is moving in a circle around that center at a speed of 250 km/s. (a) How long does it take the Sun to make one revolution about the galactic center? (b) How many revolutions has the Sun completed since it was formed about 4.5 109 years ago?
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