Detailed image of the sun showing dark sunspots against a bright surface.

Dark Spots, Strong Magnetism

Sunspots look dark because strong magnetic fields block convective heat from rising efficiently. That leaves them slightly cooler than the surrounding photosphere.

Sunspots and Solar Cycles: The Sun’s Magnetic Mood

Close-up view of the sun showing visible sunspots against a clear backdrop.

The Sun Has a Rhythm

The number and size of sunspots rise and fall in a quasi-periodic 11-year cycle. As the cycle builds, sunspots tend to appear closer and closer to the equator.

Sunspots and Solar Cycles: The Sun’s Magnetic Mood

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