The Densities Of The Planets
Not only is Earth the largest of the terrestrial planets, it is also the most dense. Saturn, meanwhile, is the least dense planet in our solar system. It's less dense than water, which has led many people to postulate that it would float. However, even if it somehow found its way to a body of water large and deep enough to contain it, Saturn would break apart and its rocky core would sink.
from Michel van Biezen
Key Facts In This Video
All of the terrestrial planets have densities greater than that of rock. (0:30)
Mars is the least dense of the terrestrial planets, and consists of only about 30% metal. (2:45)
Saturn is less dense than water. (3:26)