This is an infrared image of Jupiter showing regions which are hot.
Click on image for full size
NASA
The Source of Heat from Within Jupiter
The energy that Jupiter and Saturn make has been found be very high.
There are several ways in which astronomical objects make energy from inside. The first is by thermonuclear fusion, the way a star makes energy. Another method is by radioactive material within the ground, the way a planet makes energy.
For the giant planets, the method which seems to be at work is the mere fact that energy is given off from when a planet is in the process of shrinking together, or collapsing on itself.
The fact that Jupiter is still collapsing together indicates that the process of planet formation is still going on. This process is providing the heat from within which causes the unusual motions in the atmosphere.
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