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A mysterious glowing spiral appeared in the northern lights, and now we know what it was
As for the nature of the spiral itself, the beautiful display that has now upstaged an aurora happens when a SpaceX rocket's second stage begins its descent back into Earth's atmosphere.
The New York Times1y
This Mysterious Spiral in the Alaska Sky Had an Earthly Explanation
The spiral made its way across the sky's green ... and the reflection of the excess fuel it released into the atmosphere had probably created the dizzying pattern. Stuart Isett for The New York ...