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cratermoon
on July 1, 2023
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Time lapse of this week's large sunspot
Those bumps are convection cells in the Sun's photosphere, called "granules"[1]. They roughly 2/3rds the east-west length of the US: Richmond, Virginia to Phoenix, Arizona.
1
https://en.wikipedia.org/wiki/Solar_granule
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1 https://en.wikipedia.org/wiki/Solar_granule