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= Solar System: Kinetic Energy Facts = The kinetic energy of the Solar System mainly depends on two factors: the motion of revolution of the planets about the Sun (revolution) and the motion of rotation of the planets and the Sun itself about their axes (rotation). For the purpose of this article, satellites and minor bodies have not been taken into account.

Kinetic energy due to Revolution
$$K = \frac{1}{2} I\omega^2$$

where:


 * $$K$$ is the kinetic energy
 * $$I=mr^2$$ is the momentum of inertia of the planetary mass $$m$$ about the Sun, where $$r$$ is the mean distance of the planet from the Sun
 * $$\omega=\frac{2\pi}{T}$$ is the angular velocity of the planet, where $$T$$ is the orbital period

Total Kinetic Energy due to revolution: K = 1.98E+35 J

Kinetic Energy due to Rotation
$$K = \frac{1}{2} I\omega^2$$

where:


 * $$K$$ is the kinetic energy
 * $$I=\frac{2}{5}mr^2$$is the momentum of inertia of a sphere of mass $$m$$ about its axis, and $$r$$ is the radius.
 * $$\omega=\frac{2\pi}{T}$$ is the angular velocity of the sphere, where $$T$$ is the rotationperiod.

Total Kinetic Energy due to rotation: K = 1.65E+36 J

Solar System Kinetic Energy
The Solar System's Total Kinetic Energy can now be calculated by simply adding the total kinetic energy due to revolution to the total kinetic energy due to rotation.