In the summertime at high latitudes of both Northern and Southern Hemispheres, thin, glowing blue clouds are visible just after the sunset. These clouds, called noctilucent clouds or polar...
NASA Balloon Mission Captures Mystifying Electric Blue Clouds
In the summertime at high latitudes of both Northern and Southern Hemispheres, thin, glowing blue clouds are visible just after the sunset. These clouds, called noctilucent clouds or polar...