1. The problem statement, all variables and given/known data The Milky Way galaxy (including the sun) rotates about its center with a period of 200 million years. The sun is approx. 2 X 10^20m from the center of the galaxy. What is: A) The radial acceleration of the sun? B) What is the net gravitational force on the Sun due to other stars in the Milky Way Galaxy? 2. Relevant equations v=2(pi)(r)/period a=v^2/r I just can't get my head around the 1 revolution per 200million years. How would I work that into a velocity? And then into an acceleration?