Example 16.1 Galactic rotation For the values of the galactic rotation constants, find the time it takes the Sun to orbit the galactic center and the mass interior to the Sun's orbit.


The time for the Sun to orbit is simply the circumference, 2wR0, divided by the speed v0:


The Sun orbits the galactic center in 240 million years. We find the mass interior to R0 from equation (16.3):

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