Prominence

Astronomical Dictionary

A cloud, or plume, of hot, luminous gas in the Sun's corona. It appears bright when seen against the cool blackness of space. When they are in silhouette against the disc they are known as filaments. They are mainly composed of hydrogen, helium and calcium

 
Astronomical [1] [2] [3] [4] [5] [6] [7] [8] [9]

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