Sunspots from the most powerful geomagnetic storm on record, drawn in 1859. A and B mark initial positions of bright regions which over 5 minutes moved to C and D then disappeared. Credit: Richard Carrington
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Sunspots from the most powerful geomagnetic storm on record, drawn in 1859. A and B mark initial positions of bright regions which over 5 minutes moved to C and D then disappeared. Credit: Richard Carrington