NASA’s Astronomy Photo of the Day

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Aurora Banks Peninsula

Aurora Banks Peninsula

This well-composed composite panoramic view looks due south from Banks Peninsula near Christchurch on New Zealand's South Island. The base of a tower-like rocky sea stack is awash in the…

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AR 3664 at the Sun's Edge

AR 3664 at the Sun's Edge

What did the monster active region that created the recent auroras look like when at the Sun's edge? There, AR 3664 better showed its 3D structure. Pictured, a large multi-pronged…

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The 37 Cluster

The 37 Cluster

For the mostly harmless denizens of planet Earth, the brighter stars of open cluster NGC 2169 seem to form a cosmic 37. Did you expect 42? From our perspective, the…

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AR 3664 on a Setting Sun

AR 3664 on a Setting Sun

It was larger than the Earth. It was so big you could actually see it on the Sun's surface without magnification. It contained powerful and tangled magnetic fields as well…

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Red Aurora over Poland

Red Aurora over Poland

Northern lights don't usually reach this far south. Magnetic chaos in the Sun's huge Active Region 3664, however, produced a surface explosion that sent a burst of electrons, protons, and…

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