|Flying photographer Brian Whittaker photographed these NLCs over Canada on June 13, 2012. Image Courtesy of Brian Whittaker. View Larger|
These electric-blue ice clouds hang 53 miles (85 km) above Earth's surface, at the edge of space itself, circling the north and south pole regions. AIM has helped clarify the mystery of how they form, including information on the required temperatures and water vapor necessary in the atmosphere.
Observing tips: NLCs favor high latitudes during the summer months, although they have been sighted as far south as Colorado and Virginia. Look west 30 to 60 minutes after sunset when the Sun has dipped 6-16 degrees below the horizon. If you see luminous blue-white tendrils spreading across the sky, you may have spotted a noctilucent cloud.