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23.1 MB (3.5 MB compressed)
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19.6 x 29.5 cm ⏐ 7.7 x 11.6 in (300dpi)
CHRIS MADELEY / SCIENCE PHOTO LIBRARY CHRIS MADELEY / SCIENCE PHOTO LIBRARY
Aurora borealis or northern lights display over silhouetted trees. This curtain of light is caused by energetic charged particles from the Sun colliding with gas molecules in the upper atmosphere near the poles. Photographed near Fairbanks, Alaska, USA.
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