Photo: ESA Planetary Science Archive
The European Space Agency’s Mars Express orbiter has been taking high-resolution images and making mineralogical maps of the surface of Mars since 2004. This photo shows dense morning fog made of water ice and water vapor in the Valles Marineris canyon system. The canyon is more than 6 kilometers deep in places.









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Eliza Strickland
Eliza Strickland is a senior editor at IEEE Spectrum, where she covers AI, biomedical engineering, and other topics. She holds a master’s degree in journalism from Columbia University.
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