These green "clouds" are made up of aurora light. This picture is amazing, becuase it shows that you can see straight through auroras to the stars. They appear to be green clouds in the sky, but it is only strieks of color through the atmosphere. These Northen Lights occur high in Earth's atmosphere due to collisions of charged particles in the magnetosphere. In addition to visible light, they give off X-ray and ultraviolet light. There are forecasts for these events, which correspond to recent magnetic activity on the sun. Solar flares and other magnetic occurances on the Sun influence the intensity of the auroras seen on Earth. It is amazing that these beautiful sights can happen as a result of something so far away, and one can only imagine what people might think of these strange auroras when they had not yet been explained on a scientific level.
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