Image:Kallithea ancient.jpg

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The 5th century BC fortification of Athens (red lines) superimposed on a recent astronaut photo. Also shown the river beds in ancient times (cyan lines), the new river bed (dotted cyan line), the ancient roads coinciding with existing ones (yellow dotted lines) and the Phaleron coastline at ancient times (blue line).

Commented version of a public domain NASA file [1]

This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA copyright policy page or JPL Image Use Policy)

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The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not in the public domain.
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All materials created by the SOHO probe are copyrighted and require permission for commercial non-educational use. [3]
Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [4]