Which planet is famous for a hexagonal cloud pattern at its north pole?

• A. Jupiter
• B. Neptune
• C. Mercury
• D. Saturn

Answer: (D)

This question is about recognizing a distinctive atmospheric feature on another world. Saturn is famous for a hexagonal cloud pattern around its north pole—a stable, six-sided jet-stream structure that forms a standing wave in the planet’s atmosphere. It’s enormous, roughly 30,000 kilometers across, and has persisted for decades, a feature revealed in detail by missions like Cassini.

That makes Saturn the best choice because the hexagon is a unique marker of Saturn’s atmospheric dynamics. The other options don’t show this geometry: Jupiter has the Great Red Spot, a massive oval storm; Neptune has dramatic storms and bands but not a hexagonal polar pattern; Mercury has virtually no atmosphere, so cloud patterns don’t form there.