Straight to the point: Nacreous Clouds in less than 200 words for those of you in a rush

• Nacreous clouds develop in the lower stratosphere over polar regions when the Sun is slightly below the horizon. The clouds are illuminated from below and frequently radiate in vivid hues.
• Also known as polar stratospheric clouds
• Occur approximately 10 to 20 miles above the Earth (16,000 to 32,000 metres. )
• Shaped like large thin discs, often…