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Aurora Borealis display over Manitoba, Canada
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Aurora Borealis display over Manitoba, Canada
Aurora Borealis. Aurora Borealis or Northern Lights display over trees and snow. The setting Moon is seen at lower left. Aurorae are caused by the interaction between energetic charged particles from the Sun and gas molecules in the upper atmosphere about 100 kilometres up. A stream of charged particles, called the solar wind, flows out into space continuously from the Sun at speeds of 400-500 kilometres per second. On reaching Earth, the charged particles are drawn by Earths magnetic field to the poles, where they collide with gas molecules in the upper atmosphere, causing them to emit light. Photographed from Churchill, Manitoba, Canada
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© CHRIS MADELEY/SCIENCE PHOTO LIBRARY
Atmospheric Phenomenon Aurora Borealis Aurora Borealis Display Aurorae Canada Earth Science Effects Electromagnetic Effect Moon Northern Lights Northern Lights Aurora Display Sciences Setting Snow Solar Wind
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