PIX4671634: Noctulescent clouds - Noctilucent clouds - Noctilucent clouds, very high altitude clouds, photographs in July 2009 in Russia. These rare clouds are called noctilucent or “” night shining” as they seem to glow in the dark. They are caused by ice crystals at about 80 km altitude. These crystals reflect sunlight when the sun is well below the horizon. They are properly known as polar mesospheric clouds and are under intense study as it remains a mystery as to how they are formed. Image taken in july 2009 in Russia / Bridgeman Images
PIX4671655: Noctilucent clouds in Brittany - Noctilucent clouds in Brittany - Noctulescent clouds, very high altitude clouds, very rarely visible in France, photographs on 24 June 2009 in Ploumanac'h (Cotes d'Armor). These high altitude clouds are usually seen in summer months but nearer the poles than France. Ploumanac'h (Cotes d'Armor), Brittany, June 24 2009 / Bridgeman Images
PIX4671692: Halo around the Moon - Lunar Halo - This halo is due to the light of the Moon reflected by high-altitude clouds, cirrostratus, composed of ice crystals. They bend the light and cause a perfect circle around the Moon. This 22-degree lunar halo is quite contrasting and colourful, although the Moon is not Full (three days after the Full Moon). October 2, 2004. Lunar halos are caused by moonlight being refracted by cirro - stratus clouds. These thin clouds are located very high in the atmosphere, and are composed of ice crystals. This 22 degrees lunar halo is rather contrasted, although the Moon was not Full (three days after the full moon). 2 October 2004 / Bridgeman Images
PIX4671707: Halo around the Moon - Lunar halo - This halo is due to the light of the full moon reflected by high-altitude clouds, cirrostratus, composed of ice crystals. They bend the light and cause a perfect circle around the Moon. Image obtained on February 8, 2009. Lunar halos are caused by moonlight being refracted by cirro - stratus clouds. These thin clouds are located very high in the atmosphere, and are composed of ice crystals. They bend light at a 22 degree angle, which creates a halo that is 44 degrees in diameter. February 8 2009 / Bridgeman Images
LRI4698654: Benoit demasque the cunning of Totila, king of the Goths, to test his clairvoyance, Riggio l'ecuyer and accomplice of Totila comes to report to his king on his visit to Benoit (Benedict uncovers the cunning of Totila, king of the Goths, to test his clairvoyance, Riggio, squire and complicit of Totila reports back to the king visit to Benedict) Detail Fresco of the cloister made by Luca Signorelli (ca. 1445-1523) recounting the life of Saint Benedict of Nursia (480 - 567) founder of the Order of Benedictines 1497-1498 Abbey of Monte Oliveto Maggiore, Florence, Signorelli, Luca (c.1450-1523) / Bridgeman Images