Question
Suppose there were no additional mass in the Milky Way beyond the distance of the Sun's orbit. What would the rotation speed be at a radius of $16 \mathrm{kpc}$ (twice as far from the center as the Sun)?
Step 1
First, we need to find the mass of the Milky Way within the Sun's orbit. We know that the Sun is located at a distance of 8 kpc from the center of the Milky Way. Show more…
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