Video of a large sunspot with dark umbra, lighter penumbra, and surrounding granulated solar surface.

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1. Wonder of Science (wonderofscience@mastodon.social)'s status on Wednesday, 31-Jan-2024 12:41:38 UTC Wonder of Science

   Close-up view of a sunspot the size of Earth on the surface of the Sun filmed by the Swedish 1-m Solar Telescope. Sunspots are regions of reduced surface temperature caused by intense magnetic fields.

   Video credit: Luc Rouppe van der Voort / ISP