'Mars-related' originates from English, specifically the combination of the noun 'Mars' and the past-participial adjective 'related', where 'Mars' referred to the Roman god and later the planet, and 'related' comes from Latin roots meaning 'to bring or refer'.

'Mars' comes from Latin 'Mars' (the Roman god of war), later used for the planet; 'related' developed from Latin 'relatus' (past participle of 'referre') via Old French and Middle English, and the compound 'Mars-related' is a modern English formation combining these elements.

Initially, 'Mars' primarily referred to the Roman deity, but over time it came to denote the planet; the compound 'Mars-related' therefore shifted to mean 'connected with the planet Mars' in modern usage.