Viking 2 Orbiter image of Mars satellite Deimos from a distance of 500 km. Deimos is about 10 km across and north is up. At this distance the surface appears smooth. Many craters are partly hidden by regolith - soil and broken up material. Closer views reveal a heavily cratered surface. Deimos is irregularly shaped and extends about 10 km in its longest dimension.
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.
