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Question
Assuming a circular orbit for the Sun about the center of the Milky Way galaxy, calculate its orbital speed using the following information: The mass of the galaxy is equivalent to a single mass $1.5\times 10^{11}$ times that of the Sun (or $3\times 10^{14}\textrm{ kg}$), located 30,000 ly away.
$2.6 \times 10^{5} \textrm{ m/s}$
Solution Video