Space exploration began with the launch of Sputnik and Astrophysics was born as the application of physics to the phenomena observed by Astronomy, which etymologically means laws of the stars.
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| Filament |
A solar prominence seen in the light of certain spectral lines, particularly hydrogen alpha and those of ionized calcium, projected against the bright disc of the Sun i.e. viewed from above and appearing as a dark streak across the photosphere.
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