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Solar granules: Granules on the photosphere of the Sun are caused by convection currents (thermal columns, Bénard cells) of plasma within the Sun's convective zone. The grainy appearance of the solar photosphere is produced by the tops of these convective cells and is called granulation.
A typical granule has a diameter on the order of 1,000 kilometers and lasts 8 to 20 minutes before dissipating.
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