A close-up of the Martian moon Phobos.

Mars moon mystery: Strange structures discovered inside ‘creepy’ Phobos

Europe’s Mars Express spacecraft has peered deeper than ever into the Martian moon Phobos’ subsurface, finding hints of unknown structures that could be clues to the moon’s origin.

Mars Express, which is a 19-year-old veteran spacecraft orbiting Mars, came within 51.6 miles (83 kilometers) of Phobos on September 22, 2022 and was able to probe beneath the moon’s surface at the using upgraded software on his MARSIS (Mars Advanced Radar for Subsurface and Ionosphere Sounding) instrument.

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