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LiveScience
LiveScience
Daisy Dobrijevic

Gargantuan sunspot 15-Earths wide shoots powerful X-class flare toward Earth, triggering radio blackouts

Solar flare with the location of it on the sun in an illustration.

AR3664 is no ordinary sunspot. 

The behemoth dark patch on the sun's surface has ballooned in recent days, becoming one of the largest and most active sunspots seen this solar cycle. 

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