What object in our solar system has the most kinetic energy. I'll limit the question to the reference frame for which the Sun is fixed, but allowed to rotate. For first estimates, please assume circular orbits for the planets, and assume the Sun and planets each are perfect spheres with uniform density. After that answer has been had, feel free to go crazy and see what you get without the above assumptions.

Kinetic Energy = 1/2 Iω^{2 }

I_{solid sphere}= 2/5 mr^{2}

ω = Angular Velocity = v/r

1## Re: Solar System Kinetic Energy Problem