25.2 MB (2.5 MB compressed)
3631 x 2421 pixels
30.7 x 20.6 cm ⏐ 12.1 x 8.1 in (300dpi)
ROGER HILL / SCIENCE PHOTO LIBRARY ROGER HILL / SCIENCE PHOTO LIBRARY
Aurora borealis over water. The aurora borealis is a coloured light display (the northern lights) that is visible in the night sky, usually only at high latitudes. It occurs when charged and energetic particles from the Sun (the solar wind) are drawn by Earth's magnetic field to the polar regions. Hundreds of kilometres up, they collide with gas molecules and atoms, causing them to emit light. Photographed on 14 July 2013, near Southey, Saskatchewan, Canada.
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