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Artificial structures visible from space
Human-made things that can be seen from space
Artificial structures visible from space
Artificial structures visible from space without magnification include highways, dams, and cities. Whether an object is visible depends significantly on the height above sea level from where it is observed. The Kármán line, at 100 kilometres (62 mi), is accepted by the World Air Sports Federation, an international standard-setting and record-keeping body for aeronautics and astronautics, as the boundary between the Earth's atmosphere and outer space. However, astronauts typically orbit the Earth at several hundreds of kilometres; the ISS, for example, orbits at about 420 km (260 mi) above the Earth, and the Moon orbits at about 380,000 km (240,000 mi) away.
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