The giant planets are probably heated by gravitational contraction.

Name: The giant planets are probably heated by gravitational contraction.
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The giant planets (Jupiter, Saturn, Uranus, and Neptune) are thought to still be contracting very slowly, which releases gravitational potential energy that contributes to their heat. This process, known as Kelvin-Helmholtz contraction, is a significant source of internal heat for these planets.

The Giant Planets Are Probably Heated by Gravitational Contraction