Over Bangledesh in Tibet, China a large airglow appeared shining various colors in a target formation. This spectacular demonstration of chemiluminescence is caused by a combination of various chemicals and waves in the air, but this particular one was caused by gravity waves. Gravity waves are caused by air pressure raising air, but gravity pulling it back down. This scenario, like all airglows, can only happen over 80,000 kilometers above, or in this case, 90,000. And unlike Auroras which are the electrical variants of airglows, these are given their color by chemicals in the atmosphere, combined with gravity waves to give it the ripple effect.
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