24.4 MB (1.4 MB compressed)
2543 x 3354 pixels
21.6 x 28.4 cm ⏐ 8.5 x 11.2 in (300dpi)
JACK FINCH / SCIENCE PHOTO LIBRARY JACK FINCH / SCIENCE PHOTO LIBRARY
Aurora Borealis. View of the Aurora Borealis (northern lights) over trees. The Aurora Borealis is visible as long green horizontal streaks (lower centre) and also vertical streaks (upper centre). The aurora is caused by electrically charged particles which come from the Sun. When these particles approach Earth, they are guided by the Earth's magnetic field towards the poles. There they collide with the gases in the atmosphere hundreds of kilometres above the Earth's surface. It is these collisions which cause the airglow. Also visible is the Pleiades star cluster (upper right). Photographed in Fairbanks, Alaska, USA.
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