English: A transit of Phobos from Mars:
Phobos is in transit across the Sun, as seen from Mars by MER Opportunity on March 10, 2004, at 07:36:38 UTC Earth time. In the photo, the Sun has angular diameter 20.5' while Phobos has angular diameter of 15.1'.
Deimos by contrast usually has an angular diameter of about 2.3' as seen from Mars. Phobos took about 32 seconds to transit the Sun.
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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