So we have rocky planets, gas giants, and ice giants in Solar System. What are their differences? And how about exoplanet. Are they the same?
![Sep 8th: The Planetary Family Tree](https://cosmoquest.org/x/365daysofastronomy/files/2016/09/SpaceStories_alternate_design.png)
So we have rocky planets, gas giants, and ice giants in Solar System. What are their differences? And how about exoplanet. Are they the same?