SATURN

Saturn is not a perfect sphere. It is noticably flattened at the poles and appears oval-shaped when viewed through a telescope. Today we understand that this is due to the fluidity of Saturn's atmosphere, it's low density and relatively rapid rate of rotation.

Although Galileo was unable to explain it, it certainly put a serious dent in the Platonic ideal of heavenly objects in terms of circular perfection.

It was left to Sir Isaac Newton to eventually explain the bulge by combining the laws of motion and gravitation

Click on the picture if you can't see the oval shape