10 phénomènes mystérieux qui suggèrent l'existence... d'extraterrestres!

These are Transient Luminous Events or can also be referred to as Upper Atmospheric Lightning. This is a rare type of lightning that appears above powerful thunderstorms and is seldom seen with the naked eye because they happen so quickly. The saucer shaped one to the far left of the image is a Sprite-Halo event and the other 3 are partial Gigantic Jet lightning events. All 4 events occurred within a 1 hour period and were stacked to create this photo-composite. These events were photographed when Tropical Storm Harvey was just south of Puerto Rico on the night of August 19, 2017.