The sun is more active than experts predicted. It could mean more grounded flights, downed satellites, and stunning aurora.

The sun is more active than experts predicted. It could mean more grounded flights, downed satellites, and stunning aurora.

NASA/SDO via Reuters

From afar, the sun looks calm and peaceful in our daytime skies. But up close, it's an erupting, chaotic display of solar activity the likes of which astrophysicists didn't expect until the last year or so.

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