What was the primary directive for the *Opportunity* rover?
Answer
Ascertain whether liquid water once existed on Mars.
The primary directive given to the *Opportunity* rover was the profound task of determining if liquid water had previously existed on the Martian surface.

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What was the primary directive for the *Opportunity* rover?How long was the *Opportunity* mission initially planned to last?What key minerals were scientists looking for as evidence of past water?What specific feature of the rover's arm was key to analyzing fresh rock material?Where was *Opportunity's* twin rover, *Spirit*, tasked with exploring?What was the approximate total distance *Opportunity* traversed across Mars?What discovery cemented the case for ancient watery environments based on specific iron oxide spheres?What Martian event led to the eventual failure of the *Opportunity* rover's operations?When was the last communication successfully received from the *Opportunity* rover?What geological feature did the science team make a major stop at that offered new chapters in Martian history?What fundamental aspect of planetary exploration did *Opportunity's* extended endurance redefine?