New Scientist Space =>Mysterious glowing clouds targeted by NASA
Glowing, silvery blue clouds that have been spreading around the world and brightening mysteriously in recent years will soon be studied in unprecedented detail by a NASA spacecraft.
The Aeronomy of Ice in the Mesosphere (AIM) mission will be the first satellite dedicated to studying this enigmatic phenomenon. Due to launch in late 2006, it should reveal whether the clouds are caused by global warming, as many scientists believe.
A similar phenomena can make weather balloons look like convincing UFOs just before sunrise or after sunset.