04-17-2020, 04:54 AM
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Senior Member
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Join Date: Mar 2017
Location: ABQ, New Mexico
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Nacreous clouds look like light waves of various colors. They are rare since they're only visible within two hours after sunset or before dawn. However, they're more common during winter time in places where there are high altitudes, like in Antartica, Scandinavia, Iceland, and Canada.
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