Beautiful curtains of pink and green light swirled in night skies around the world in May during one of the strongest displays of auroras in half a millennium.
The source of that light show was the sun. In the first week of May, a barrage of explosive solar flares and coronal mass ejections blasted billions of tons of material from the sun into space. This created the strongest solar storm in more than two decades, resulting in auroras as far south as Florida and parts of northern India (SN: 2/26/21).
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