Lightning was captured over Eastern Romania (shown) at about 8:55pm UTC, and a video was made by stitching together 49 images taken on the ISS while travelling at 17,100mph (27,600km/h) Estimates suggest that 100 discharges can occur between the system of clouds and the surface of Earth each second, causing many lightning strikes, so for astronauts seeing such a sight is not all too rare.
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