Mars has air, but not the kind that people can breathe. Even on the warmest days, the temperature is too cold for people to live comfortably. When astronauts go to Mars, they will always need to be in spacesuits or inside buildings to live.
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.
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