Aurora over mountains, Alaska

Aurora over mountains, Alaska

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Credit: CHRIS MADELEY/SCIENCE PHOTO LIBRARY

Caption: An impressive display of the northern lights and the milky way in the Brooks Range, Alaska, USA. The Aurora Borealis is a natural light phenomena that is visible in the night sky, usually only at polar 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.

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Keywords: alaska, american, arctic, astronomical, astronomy, astrophysical, astrophysics, atmosphere, atmospheric, aurora, aurora borealis, aurorae, auroral, auroras, boreal, brooks range, camping, celestial, color, colored, colors, colour, coloured, colours, earth science, false-coloured, glow, glowing, green, light display, lights, magnetic, meteorological, meteorology, milky way, mountain, mountains, natural, nature, night, night sky, north, north america, north american, northern, northern lights, oxygen emission, physical geography, physics, polar region, river, sky, solar activity, solar wind, space weather, trees, united states, us, usa, weather

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