planet structure

Planets have structure that can be modeled similar to stellar structure, relating temperature, pressure, density, energy transmission, and their effects on the constituents. Some of the same equations are appropriate and useful. Among the planet-specific factors:

• Trapped heat from planet formation can be a long-term factor.
• Radioactive heating can be a significant 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.
• The planet's constitution depends upon the results of planet formation details, such as lack of lightweight molecules from the atmosphere if they were eliminated early.

Gas giants are more like stars than are rocky planets, but do have their own specific characteristics.