I have a new post over on the Mars Express blog: “From Earth all natural celestial objects rise in the east and set in the west.  The same is not true at Mars.  Phobos goes in reverse.

If you were to stand on the surface of the Red Planet, Phobos would rise in the west.  It would appear about one-third the apparent size of our Moon as seen from Earth’s surface, and it would cross the Martian sky against the flow of the other celestial objects before setting in the east.  What makes Phobos so different? ...”

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