The sun in Hydrogen-alpha on 20. April 2021 at local time (Hidra, Agder, Norway). Solar spots and prominences are visible.

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Photo credit: © Alf Jacob Nilsen / Alamy / Afripics
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Keywords: astronomi, astronomy, flares, prominence, prominences, protuberances, protuberanser, sol, sola, solar, solen, solflekker, spots, sun, sunspots, system