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What causes Jupiter’s colorful belts and zones?
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Jupiter
Photograph of Jupiter taken by Voyager 1 on February 1, 1979, at a range of 32.7 million km (20.3 million miles). Prominent are the planet's pastel-shaded cloud bands and Great Red Spot (lower centre).
Jupiter’s appearance is defined by alternating dark bands called belts and bright bands called zones, which are maintained by stable, large-scale latitudinal currents in the planet's atmosphere. Because Jupiter lacks a solid surface, these currents and their associated cloud patterns persist remarkably over time.1
The variations in color across these bands are believed to result from chemical differences in cloud composition. While the exact causes remain a subject of scientific investigation, researchers have developed several hypotheses:1
- Cloud Composition: The highest, bright white clouds consist of frozen ammonia crystals. Lower, tawny-colored clouds likely consist of condensed ammonium hydrosulfide.2
- Coloring Agents: Scientists suspect that sulfur compounds, such as ammonium polysulfides, may be responsible for the various shades of brown and yellow.2
- Localization: The specific colors and features—such as the Great Red Spot or equatorial "hot spots"—imply a complex, localized chemistry that is still not fully understood.12
Ultimately, these cloud systems are segregated both vertically and horizontally, creating the distinct banded appearance observed from Earth.1