JOHN SANFORD / SCIENCE PHOTO LIBRARY JOHN SANFORD / SCIENCE PHOTO LIBRARY
International Space Station (ISS), time-exposure image. The trail of the ISS as it crosses the sky is seen at upper left. The ISS orbits at an altitude of around 360 kilometres, and takes about 92 minutes to complete one orbit of Earth. From Earth, the ISS has a visual magnitude around -1, almost as bright as Sirius, the brightest star. This brightness is due to the high reflectivity of the station's extensive solar panel array. Photographed from Starhome Observatory, Springville, California, USA.
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