Earth and star trails. Time exposure image of star trails and the Earth (bottom) taken from the International Space Station (ISS, part seen at top). This is a composite image of several short exposures combined to give an exposure equivalent to approximately 15 minutes. City lights (orange) and air glow (green) are seen over Earth. Image taken by astronaut Don Pettit on 17th May 2012, during Expedition 31.
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