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Transient Lunar Phenomena
Reports have also been made of single or successive flashes or of some steadier light that may persist for seconds or even hours. As one notable example, French astronomer Audouin Dollfus observed a glowing orangish color in the crater Langrenus in 1992 and obtained images of changes in the glow. The light was also observed by an orbiting spacecraft. Dollfus took these TLP as possible indications of gas escaping from fractures in the crater, but they have also been interpreted as visual effects rather than true TLP.