保护地球，探索宇宙，发现文明
2020 January 15 Iridescent Clouds over Sweden Image Credit & Copyright: Goran Strand Explanation: Why would these clouds multi-colored? A relatively rare phenomenon in clouds known as iridescence can bring up unusual colors vividly or even a whole spectrum of colors simultaneously. These polar stratospheric clouds clouds, also known as nacreous and mothe...
2020 January 10 Nacreous Clouds over Sweden Image Credit & Copyright: P-M Hedén (Clear Skies, TWAN) Explanation: Vivid and lustrous, wafting iridescent waves of color filled this mountain and skyscape near Tanndalen, Sweden on January 3. Known as nacreous clouds or mother-of-pearl clouds, they are rare. This northern winter season they have been making u...