Mars' moon Phobos may actually be a comet — or at least part of one — that was gravitationally captured by the Red Planet long ago, a new preprint study based on previously unpublished photos ...

The USSR, and later Russia, developed three missions exclusively for the study of the martian moons: Phobos 1 and 2 in the late 1980s, which saw radio contact break off after arriving at Mars after ...