Strange clouds...electric-blue noctilucent clouds

STRANGE CLOUDS: On June 10th, another wave of electric-blue noctilucent clouds spread across northern Europe. "This is my first sighting of these beautiful clouds," says Alan C. Tough of Elgin, Moray, Scotland. "Well worth the wait!"


Noctilucent clouds (NLCs) are a mystery. They float through the outer reaches of Earth's atmosphere at the very edge of space. Some scientists think the clouds are seeded by space dust and fed by rocket exhaust. Others suspect they're a sign of global warming. Later this year, NASA plans to launch a satellite named AIM to investigate. Want to see them yourself? Look west after sunset for sinuous, blue-glowing ripples in the sky.

SpaceWeather.com