Nacreous 瑞典上空的珍珠云
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...