Why are Uranus and Neptune not just smaller Jupiters?

What do composition, sideways rotation, internal heat, extreme winds, and tilted magnetic fields reveal about the ice giants?

Replace the snowball image with hot volatile-rich interiors, then compare two cyan worlds whose orientation and energy budgets tell different stories.

Artistic comparative portrait of pale cyan Uranus with sideways rings and Neptune with white clouds and a dark storm. — Artistic scientific reconstruction: Uranus and Neptune are shown together for comparison. Scale, distance, simultaneous lighting, ring visibility, and storm placement are composed rather than directly observed in one frame.

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