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Sunspot Group AR 2339 Crosses the Sun

How do sunspots evolve? Large dark sunspots -- and the active regions that contain them -- may last for weeks, but all during that time they are const…

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NASA APOD: Sunspot Group AR 2339 Crosses the Sun (© Stanislav Korotkiy (AstroAlert) & Mikhail Chubarets; Music: Pas de Deux (Bird Creek))