Here, we're seeing the Sun in four types of extreme ultraviolet light — "colors" our eyes can't see. Together, they reveal different regions of the Sun's atmosphere at different temperatures, from areas closer to the surface to the hotter outer regions.

🟢 9.4 nm — hottest outer atmosphere

🟡 17.1 nm — outer atmosphere

🟣 21.1 nm — transition region

🔴 30.4 nm — lower region above the surface

Captured by the Solar Ultraviolet Imager on China's Fengyun‑4C satellite, we can now track solar activity and eruptions as they happen — helping protect satellites, navigation, and communications on Earth.

One Sun. One moment. Four views.