Image:RX J1856.5-3754.jpg

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RX_J1856.5-3754.jpg‎ (531 × 525 pixels, file size: 130 KB, MIME type: image/jpeg)

X-ray image of RX J1856.5-3754. Source: [1]. The image is 20 arcseconds on a side.

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.
Materials from the Hubble Space Telescope may be copyrighted if they do not explicitly come from the STScI. [2]
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]