Artificial structures visible from space information
Human-made things that can be seen from space
Artificial structures visible from space without magnification include highways, dams, and cities.[1][2][3] The Great Wall of China, often cited as the only human-made structure visible from space, is not visible from low Earth orbit without magnification, and even then can be seen only under perfect conditions.[3][4] On the other hand, the centimetre-band Spaceborne Imaging Radar of STS-59 and STS-68 was able to detect not only the Great Wall but also invisible buried segments of it.[5]
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.[6] However, astronauts typically orbit the Earth at several hundreds of kilometres;[3] the ISS, for example, orbits at about 420 km (260 mi) above the Earth,[7] and the Moon orbits at about 380,000 km (240,000 mi) away.[3]
^Emery, David. "What's Visible from Outer Space". About.com: Urban legends. Archived from the original on 28 September 2009. Retrieved 12 May 2010.{{cite web}}: CS1 maint: unfit URL (link)
^Cecil Adams, "Is the Great wall of China the only manmade object you can see from space?", The Straight Dope, found at The Straight Dope website. Accessed 12 May 2010.
^ abcdSnopes, "Great wall from space", last updated 21 July 2007, found at Snopes.com archives. Accessed 12 May 2010.
^"the wall is only visible from low orbit under a specific set of weather and lighting conditions. And many other structures that are less spectacular from an earthly vantage point—desert roads, for example—appear more prominent from an orbital perspective." The Afsluitdijk in The Netherlands can also be seen from outer space Scientific American found at Is China's Great Wall Visible from Space? at Scientific American website.
^JPL, April 18, 1996, Space Radar Reveals Ancient Segments of China's Great Wall
^"The 100 km Boundary for Astronautics" (DOC). Fédération Aéronautique Internationale Press Release. 24 June 2004. Retrieved 30 October 2006.
^Peat, Chris. "ISS – Orbit". Heavens-Above. Retrieved 7 January 2020.
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