View Full Version : Mysterious Noctilucent Clouds As Seen from Space

2011-Feb-09, 06:00 PM
Mysterious “night shining” or noctilucent clouds are beautiful to behold, and are usually seen during the summertime, appearing at sunset. They are thin, wavy ice clouds that form at very high altitudes and reflect sunlight long after the Sun has dropped below the horizon. Scientists don’t know exactly why they form, but continue to observe [...]

More... (http://www.universetoday.com/83192/mysterious-noctilucent-clouds-as-seen-from-space/)