An aurora borealis over Whitehorse, Yukon, Canada, on the night of September 3 (local time). A coronal mass ejection left the sun on August 31 and interacted with the earth's magnetosphere, causing the aurora, three days later.
The coronial mass ejection from the sun that caused the dramatic aurora. The image above includes an image of Earth to show the size of the CME compared to the size of Earth.
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