A conceptual image showing the Solar System's four largest planets on the same scale (their rings are omitted for clarity). Jupiter is by far the largest planet, bigger in volume than all of the others combined. Saturn, the next biggest, is about 85% as big as Jupiter, but significantly less spherical. It bulges at the equator due to its rapid rotation combined with its low density. Lastly, Uranus (green) and Neptune (blue) are almost identical in size, with Uranus just slightly bigger at 37% the size of Jupiter.