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]
Image Caption at source: When inner planets are between Earth and Sun they are said to be at inferior conjunction. When on the far side of the Sun they are at superior conjunction. Sometimes at inferior conjunction the planes of the orbits align, and Mercury and Venus are seen as dark dots on the face of the Sun as they pass in transit.
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