Over the past three days, spectacularblues lit up the skies of France in the middle of the night. Despite their “fantastic” appearance, it is a phenomenon well known, but rather rare: or moths, which are visible annually at night around the time of the between mid-June and mid-July.
The chances of seeing them are greatest between midnight and 4 a.m., but it is impossible to predict their appearance with certainty.
These very high altitude clouds (80 to 90 kilometers above the ground) are in fact dust from, or volcanic, surrounded by ice. They can also form a few days after takeoff from a or from a satellite, as it was linked to the launch of the satellite .