Pilots claimed to have seen them, now scientists are keen to study them. Going byrndesignations more akin to fantasyland than esoteric science categorization, red sprites, blue jets and elves are the names given to 'transient luminous events', otherwise known as TLEs. First reported when jet airliners began to fly at high altitude, at first scientists doubted their existence. Then, in 1989, the first photographs were obtained, and suddenly scientists got interested.
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