Sunspot 963

The sunspot's two dark cores are each larger than Earth, and they are connected by an unstable magnetic field that crackles with C-class solar flares. The eruptions have been entertaining onlookers. "I watched in amazement for hours as the magnetic loops swayed back and forth," says Larry Alvarez of Flower Mound, Texas. He made a movie of the action using his SolarMax90 solar telescope.

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