You can see the size differences among the planets in our solar system with the naked eye. Not so with their densities. While that number might seem meaningless to you or me, it tells astronomers a lot about what the planet is made of.
What's Going On
What This Means
Comparing The Densities Of The Planets
Learn about planet densities from a teacher in a bow tie.
Key Facts In This Video
All of the terrestrial planets have densities greater than that of rock. 00:30
Mars is the least dense of the terrestrial planets, and consists of only about 30% metal. 02:45
Saturn is less dense than water. 03:26
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