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Although we say that the Earth orbits the Sun, in reality they are both orbiting the center of mass. It turns out that the equation for the size of the Sun’s orbit around the center of mass is to take the full semi-major axis (1 AU) and multiply it by M<sub>Earth</sub>/(M<sub>Sun</sub> + M<sub>Earth</sub>), sometimes known as the fulcrum equation. What is the semi-major axis of the Sun’s orbit around the center of mass in km?

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