Larger moon of Mars (6)
I believe the answer is:
phobos
(Other definitions for phobos that I've seen before include "another world" , "heavenly body" , "Moon of Mars" , "Planetary moon" , "Satellite of Mars" .)
I believe the answer is:
phobos
(Other definitions for phobos that I've seen before include "another world" , "heavenly body" , "Moon of Mars" , "Planetary moon" , "Satellite of Mars" .)