This image, originally posted to Flickr, is currently not available on Flickr under the license specified on this page. However, please see {{PD-USGov-NASA}} for permission to use it under this license.
The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]