Noctilucent clouds sparkle over the Neris River in Vilnius, Lithuania (Image credit: Photo by Jaugen Jerczak/SOPA Images/LightRocket via Getty Images)
Noctilucent cloud season is here! Here's what you need to know about when to see this amazing phenomenon as we approach peak viewing season during the summer months.
Astronomers and clouds are natural enemies, largely because clouds often obscure the sky with a thick curtain of condensed water vapor.
The exception to this rule are noctilucent clouds, thin streams of icy particles that appear to glow spectrally blue in reflected sunlight in the hours after sunset and before dawn. These rare clouds form about 50 miles (80 kilometers) above Earth in the mesosphere, a cold layer of the atmosphere that lies about 43 miles (70 kilometers) above where ordinary clouds form.
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