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rainbow Nacreous Clouds - Iceland - Polar stratospheric clouds or PSCs, also known as nacreous clouds (from nacre, or mother of pearl, due to its iridescence), are clouds in the winter polar stratosphere at altitudes of 15,000–25,000 meters. They are best observed during civil twilight when the sun is between 1 and 6 degrees below the horizon. They are implicated in the formation of ozone holes.

rainbow Nacreous Clouds - Iceland - Polar stratospheric clouds or PSCs, also known as nacreous clouds (from nacre, or mother of pearl, due to its iridescence), are clouds in the winter polar stratosphere at altitudes of 15,000–25,000 meters. They are best observed during civil twilight when the sun is between 1 and 6 degrees below the horizon. They are implicated in the formation of ozone holes.

Lenticular cloud - Mt. Adams, Washington - I know this photographer - beautiful work!

Lenticular cloud - Mt. Adams, Washington - I know this photographer - beautiful work!

Supernova light burst over Finland.

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~~Silk pouches ~ mammatus cloud display on June 26, 2011, the sky was literally exploding about 15 minutes after sunset, Nebraska by brettnickeson~~

~~Silk pouches ~ mammatus cloud display on June 26, 2011, the sky was literally exploding about 15 minutes after sunset, Nebraska by brettnickeson~~

cirro-cumulo stratus clouds | ... by the refraction of light through ice crystals in cirrus clouds

cirro-cumulo stratus clouds | ... by the refraction of light through ice crystals in cirrus clouds

Clouds are sometimes iridescent but it is extremely uncommon and only observed in thin, wispy types of clouds like cirrus or cirrocumulus clouds, not this kind of cloud. This image is quite clearly fake.

Clouds are sometimes iridescent but it is extremely uncommon and only observed in thin, wispy types of clouds like cirrus or cirrocumulus clouds, not this kind of cloud. This image is quite clearly fake.

Wild cirrus sky. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

Wild cirrus sky. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *