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

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purple sun sphere with bumpy bright spots including a giant bright flare in the middle
The sun emits the largest solar flare of this 11-year cycle, as imaged by NASA's Solar Dynamics Observatory on October 3.

NASA/SDO

Watch the sun show off all year with a total eclipse, strong solar storms, and NASA almost landing on the solar surface

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the sun glowing yellow-orange orb in black space covered in roiling plasma with two dark large spots
The sun develops coronal holes, one of many forms of solar activity that could peak this year.

NASA Solar Dynamics Observatory

A giant eruption covered 'over half the sun,' then crashed into Earth nearly 12 hours earlier than forecast

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sun solar surface side by side images left shows the full orange disk with a giant loop of plasma circled and a green arrow pointing to that loop on the right in a purple close-up
This filament formed on the sun, then erupted to send solar material speeding toward Earth.

NASA Solar Dynamics Observatory

A giant eruption from the sun could bring the Northern Lights as far south as New York, Chicago, and Portland overnight Monday and early Tuesday

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ribbons of green pink purple northern lights stretch across the night sky above homes and lights of a sprawling town
Northern Lights, also called aurora borealis, dance in the sky over Tromso, Norway.

NTB/Rune Stoltz Bertinussen/Reuters

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