Mars moon mystery: Strange structures found inside 'fearful' Phobos
Europe's Mars Express spacecraft has peered deep into the subsurface of the Martian moon Phobos, finding unknown structures that could reveal the moon's origin.
TroibNews 
Europe's Mars Express spacecraft has peered deep into the subsurface of the Martian moon Phobos, finding unknown structures that could reveal the moon's origin.
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