Friday, September 5, 2014

APOD 1.2



Viewed in Tibet, this exotic sky is caused by airglow. It is created by the alternation of air pressure of the waves, which in this case it is 90 kilometers up. This is called gravity waves. Do not be confused, this is not   like auroras. Airglow is caused by a chemical reaction instead of the collision of charged particles. This phenomenon allows the sky to never be completely dark throughout the night. What a beauty!





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