Lucky imaging (also called lucky exposures) is one form of speckle imaging used for astronomical photography. Speckle imaging techniques use a high-speed camera with exposure times short enough (100 ms or less) so that the changes in the Earth's atmosphere during the exposure are minimal.
With lucky imaging, those optimum exposures least affected by the atmosphere (typically around 10%) are chosen and combined into a single image by shifting and adding the short exposures, yielding much higher resolution than would be possible with a single, longer exposure which includes all the frames.
Read more about Lucky Imaging: Explanation, Demonstration of The Principle, History, Lucky Imaging and Adaptive Optics Hybrid Systems, Popularity of Technique, Alternative Methods
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—Ernest Hemingway (1899–1961)