CHRIS MADELEY / SCIENCE PHOTO LIBRARY CHRIS MADELEY / SCIENCE PHOTO LIBRARY
Star trails and colourful bands of the aurora (aurora borealis) over trees in Northern Alaska. This coloured light display is visible in the night sky, usually only at high latitudes. It occurs when charged and energetic particles from the Sun 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 in Wiseman, Northern Alaska.
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