Neptune is unique among the giant planets because it possesses a significant internal heat source that drives its extreme weather. While most planets receive their energy primarily from sunlight, Neptune radiates much more energy from its interior than it receives from the Sun. This internal heat is believed to be a remnant of the planet's formation and the gravitational contraction of its massive core.
This internal thermal energy creates a strong temperature gradient between the planet's deep interior and its outer atmosphere. As heat rises from the core, it drives powerful convection currents within the atmospheric layers. These currents fuel the massive, fast moving wind patterns and supersonic jet streams that characterize Neptune's atmosphere. Because the solar energy at Neptune's distance is so weak, this internal heat becomes the primary engine for the planet's dynamic weather systems.
For more detailed scientific data regarding our solar system, you can visit NASA at https://science.nasa.gov.
