What is inside a planet with no solid surface?

How can an orbiter reveal layers it can never photograph or touch?

Descend from visible clouds into compressed fluids, metallic hydrogen, and an uncertain core, then follow the measurements that make the hidden interior scientifically readable.

Artistic scientific reconstruction of Jupiter and Saturn with conceptual cutaway wedges revealing compressed fluid layers and uncertain cores. — Artistic scientific reconstruction: layer borders, colors, core sizes, and the cutaway opening are conceptual and not to scale. No camera has photographed these interiors.

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