planet structure

Planets have structure that can be modeled similar to stellar structure. Some of the same equations are appropriate and useful. Among the other factors:

• Trapped heat from planet formation can be a long-term factor.
• Radioactive heating can be an energy source.
• Absorption of the host star's EMR is a factor, including the effect of the atmosphere on received EMR.
• Albedo is a factor.
• Its constitution depends upon the results of planet formation, e.g., the loss of lightweight molecules from the atmosphere.

Gas giants in some ways present a more star-like model but have their own specific characteristics.