The planets of the outer Solar System are Jupiter, Saturn, Uranus and Neptune. The former two are the giant planets, the latter two are also known as sub-giants. The planets are significantly more massive (compare Table 1 of Section 4.2.2.2) than the terrestrial planets and have considerably larger radii. Their mean densities are much smaller, between roughly 690 kg/m (Saturn) and 1640 kg/m (Ne...
