Polar mesospheric clouds Noctilucent clouds (as they are known when seen from the ground) occur
Polar mesospheric clouds Noctilucent clouds (as they are known when seen from the ground) occur at high latitudes and altitudes during the summer months, and appear gorgeous when the sunlight is reflecting off them during twilight. This is also true of the view from orbit, and astronauts report it is one of the most stupendous (out of many) sights from the viewpoint 350km up of the International Space Station. These ones were snapped over southern Ukraine, and are about 80-100 km above the ground. Over the last decades they have been visible ever further south, and seem to be brighter. Scientists think that there may be a link to climate change, such as a rise in water vapour in the upper atmosphere forming denser patches of ice crystals. LozImage credit: NASA -- source link
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