Neptune has the fastest winds in the solar system, a mysterious internal heat source, a moon with active geysers, and possibly diamond rain falling through its crushing interior — yet humanity has only visited it once. In this deep dive we explore Neptune's mathematical discovery, its extreme atmosphere, Triton's strange retrograde orbit, its faint arc-shaped rings, the Voyager 2 flyby, and why no spacecraft has ever gone back. If you're curious about astronomy, the outer planets, or the solar system's most extreme world, this video breaks it all down.

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