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Two images of the solar disc, side-by-side. The first shows the sun in hydrogen-alpha light, and the second shows the sun in ordinary visible white light. The hydrogen-alpha image makes it possible to see details like prominences, flares and other structures present in the solar chromosphere, while the white-light image shows details in the solar photosphere, such as sunspots.

Liverpool Astronomical Society

Sic Itur Ad Astra – Thus The Way To The Stars : 141 years of astronomy

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