View Full Version : Noctilucent Clouds Electric-Blue Visitors From The Twilight Zone

2013-May-31, 01:30 PM
Every year at this time I add a new item to my list of what to watch for in the night sky. Oddly enough, it’s clouds. I must be nuts, right? What astronomer needs more clouds? But these are different. Called*noctilucent clouds*(NLCs), these skittish objects are visible now and again low in the northern sky [...]

More... (http://www.universetoday.com/102536/noctilucent-clouds-electric-blue-visitors-from-the-twilight-zone/)