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A restless sunspot threw off a double solar flare Monday (April 25), triggering some radio blackouts over Asia and Australia. 

The sunspot AR2993 erupted with two M1 flares in quick succession, according to spaceweather.com. Solar flares are eruptions of electromagnetic radiation; M-class flares are moderate-sized flares that can disrupt some radio frequencies and sometimes expose astronauts in space to higher-than-usual levels of radiation. 

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