The sun is at its 11-year maximum. That means another year of eruptions that can endanger satellites, ground flights, and spark stunning auroras.

The sun is at its 11-year maximum. That means another year of eruptions that can endanger satellites, ground flights, and spark stunning auroras.

NASA/SDO

Thanks to the sun, we're in the middle of the best time to see the northern lights — and maybe the worst time to be a satellite.

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