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| Aurora Borealis |
The aurora borealis, or northern lights, is a phenomena seen somewhat frequently in the far northern latitudes. Aurorae borealis are more common when the nights become longer after the autumnal equinox. The lights are formed by a combination of ionized nitrogen and excited oxygen returning to ground state. The southern counterpart, aurora australis, is only visible from latitudes in the extreme south. The colors of the aurorae are caused by the different elements involved. Green lights are a sign of oxygen, while blue or red is an indicator of nitrogen's involvement.
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