An image of the sun emitting a significant solar flare

Nasa’s Solar Dynamics Observatory, which watches the sun constantly, captured an image of the sun emitting a significant solar flare. This flare is classified as an X1.8-class flare. X-class denotes the most intense flares, while the number provides more information about its strength. An X2 is twice as intense as an X1, an X3 is three times.
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