Here's why:
* The Sun revolves around the Milky Way: Our Sun, along with all the stars in our solar system, orbits the center of the Milky Way galaxy. It takes approximately 225 to 250 million years for the Sun to complete one full orbit.
* The Milky Way doesn't revolve around the Sun: The Milky Way galaxy is a massive collection of stars, gas, and dust, and our solar system is just a small part of it. The Milky Way is not revolving around anything in the same way that the Sun revolves around the Milky Way.
So, while the Sun takes a very long time to orbit the Milky Way, it's the Sun that's revolving, not the galaxy.