This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
This file has been superseded by Mars Viking 12a240.png. It is recommended to use the other file. Please note that deleting superseded images requires consent.
Reason to use the other file: "Higher quality image"
Viking 1 Lander image of a martian sunset over Chryse Planitia. In this image the sun is 2 degrees below the local horizon. The banding in the sky is an artifact produced by the incremental brightness levels of the camera. This image was taken on the 30th martian day (sol) after touchdown, at 19:13 local time (10:40:31 on 20 August 1976 (UTC)). The camera is pointing towards the southwest. Image reference: Viking 1 Lander, 12A240 (from the NSSDC).
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]