Why do gas planets generally have lower average temperatures than the?

Gas giants generally have lower average temperatures than terrestrial planets due to their greater distance from the Sun, which results in less solar energy reaching them. Additionally, their thick atmospheres, composed primarily of hydrogen and helium, can trap heat but do not retain as much warmth as the solid surfaces of rocky planets. Furthermore, gas giants have large sizes and high gravitational forces, which contribute to their ability to hold onto cooler temperatures in their outer layers.