Crossword Genius

Planet explored by the Opportunity rover (4)

Ross

I believe the answer is:

mars

(Other definitions for mars that I've seen before include "one associated with war" , "Holst's Bringer of War" , "Red planet and god of war" , "Spoils - heavenly body" , "Where Beagle 2 was landed on 25 December 2003" .)

I've seen this clue in the USA Today.
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