The law of
suggests that the orbit of planets is not circular but

Newton's law of universal gravitation ... massaged and manipulated

with a lot of calculus and geometry ... predicts that closed gravitational

orbits are ellipses.  

The circle is such a precise special kind of ellipse that a circular orbit

never occurs.  The chance of it is like the chance of flipping a coin and

having it land standing up on its edge ... possible, but very improbable.

answerclassical conditioning;