Like our moon, Deimos is tidally locked to Mars, meaning the same side always faces the planet—the only side visible to rovers on the Martian surface. The only way to see Deimos’ far side up ...

Martian moon Deimos seen crossing the face of Mars in this sequence of Thermal Infrared Imager images acquired during the Hera mission's gravity-assist flyby of Mars on March 12, 2025.

While on a flyby of Mars, Hera was able to use three of its imaging instruments to capture images of Deimos, the smaller of Mars' two moons, the ESA said. Deimos is about 15,000 miles from Mars.

Mars' moon Deimos silhouetted against the red planet, which appears blue from an infrared image, as captured by ESA’s Hera spacecraft. Photo / AFP On the way to investigate the scene of a ...

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