The outer layers of a star from which light escapes and can be directly observed, consisting of the photosphere, chromosphere, and corona. These layers determine the star's observable properties like color, spectral lines, and surface temperature.
From Latin 'stella' meaning star and Greek 'atmos' meaning vapor plus 'sphaira' meaning sphere. The concept developed as astronomers realized that stellar surfaces have layered structures similar to planetary atmospheres but composed of hot, ionized gas.
Stellar atmospheres are cosmic laboratories where we can study matter under conditions impossible to recreate on Earth—temperatures of thousands of degrees and magnetic fields millions of times stronger than our planet's! The spectral lines formed in these atmospheres are like stellar fingerprints, revealing not just what stars are made of, but their temperature, gravity, rotation, and magnetic activity.
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