Aurora borealis

IMAGE NUMBER: P7210 LICENSE: RIGHTS MANAGED

Aurora borealis. Bright display of the aurora borealis (or northern lights) over trees and snow covered mountains. An aurora is caused by the interaction between charged particles from the Sun and gas molecules in the Earth's upper atmosphere about 100 kilometers altitude. A stream of charged particles called the solar wind, flows out into space continuously from the Sun at speeds of 400-500 kilometers per second. On reaching Earth, these energetic particles are drawn by Earth's magnetic field to the poles where they collide with gas molecules in the upper atmosphere, causing them to emit streaks of light. Photographed at Panguingue Creek, Alaska.

Credit: Michael Giannechini / Science Source

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