Planetary equilibrium temperature

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What Wikipedia says

The planetary equilibrium temperature is a theoretical temperature that a planet would be if it were in radiative equilibrium, typically under the assumption that it radiates as a black body being heated only by its parent star.

Excerpt from the Wikipedia article “Planetary equilibrium temperature”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jcuhfehl, CC BY-SA 4.0, via Wikimedia Commons.