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Deimos
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Deimos, the outer and smaller of the two known moons of Mars, photographed by the Viking 2 orbiter in October 1977 from a distance of about 1,400 km (870 miles). Although scarred with impact craters, Deimos appears smoother than its companion moon, Phobos, because it is covered with a thick layer of fine rocky debris (regolith).
Mars's moons explained
Gaspra, Deimos, and Phobos compared Mars: moons Phobos and Deimos
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Deimos: Media

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Videos

Mars's moons explained
An overview of Phobos and Deimos, the moons of Mars.
Video: © Open University (A Britannica Publishing Partner)

Images

Deimos, the outer and smaller of the two known moons of Mars, photographed by the...
NASA/Goddard Space Flight Center
Gaspra, Deimos, and Phobos compared
Photo montage showing Gaspra (top) compared with Deimos (lower left) and Phobos,...
JPL/NASA
Mars: moons Phobos and Deimos
The Martian moons, Phobos (left) and Deimos (right), photographed by the Viking orbiters....
National Aeronautics and Space Administration/Malin Space Science Systems